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A lightweight SASS mixin library and responsive CSS layout engine.

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NO LONGER SUPPORTED

Propel

A lightweight SASS mixin library and responsive CSS layout engine.

Table of Contents

Getting Started

You can either download a copy of the source files or install via NPM.

npm install rocket-propel

SASS Implementation

Start by importing the necessary file into your own SASS file and include the required mixins.

SASS

@import "rocket-propel/build/sass/import";

.example {
   @include row();

   .left, .middle, .right {
      @include span(12); // 100% width
   }
   @include breakpoint($bpLarge) {
      .left {
         @include span-new(6); // 50% width
      }
      .middle {
         @include span-new(4); // 33.33% width
      }
      .right {
         @include span-new(2); // 16.66% width
      }
   }
}

HTML

<div class="example">
   <div class="left"></div>
   <div class="middle"></div>
   <div class="right"></div>
</div>

Browser Prefixes

Propel will apply all the necessary browser prefixes where needed but no longer supports the -o- prefix for older versions of Opera. Opera now uses the Blink engine from Chromium (Read More).

Find the other available mixins below:

Variables

Propel comes pre-packaged with a host of SASS variables. They are all listed below.

Variable Default
$columnLimit 12
$fontFamily 'Open Sans', Helvetica, Arial, sans-serif
$limitWidth 68.750em
Breakpoints
Variable Value Evaluates To
$bpSmall 21.875em 350px
$bpMedium 46.875em 700px
$bpLarge 68.750em 1100px
Colours
Type Variables
Mono $black $blackBase $greyX2Light $greyXLight $greyLight $grey $greyDark $greyXDark $greyX2Dark
Primary $aqua $blue $green $orange $pink $purple $red $yellow
Secondary $asbestos $asphalt $bondiBlue $cloud $concrete $greyBlueXLight $greyBlueLight $greyBlue $greyBlueDark $greyBlueXDark $midnight $offWhite $offWhiteDark $riverBed $silver
Spacing
Variable Value
$spaceBase 24px
$spaceSmall 12px
$spaceMedium 48px
$spaceLarge 72px
Text
Variable Value
$georgia Georgia, Cambria, "Times New Roman", Times, serif
$helvetica "Helvetica Neue", Helvetica, Arial, sans-serif
$impact Impact, Charcoal, sans-serif
$lato 'Lato', sans-serif
$lucindaGrande "Lucida Grande", Tahoma, Verdana, Arial, sans-serif
$monospace Menlo, "Bitstream Vera Sans Mono", "DejaVu Sans Mono", Monaco, Consolas, monospace
$openSans 'Open Sans', Helvetica, Arial, sans-serif
$roboto 'Roboto', 'Helvetic Neue', Helvetica, Arial
$tahoma Tahoma, Geneva, sans-serif
$timesNewRoman "Times New Roman", Times, serif
$trebuchet "Trebuchet MS", Helvetica, sans-serif
$verdana Verdana, Geneva, sans-serif
Text Size

The size evaluates to an em value and then down to a pixel value.

Variable Evaluates To
$sizeSmall 14px
$sizeBase 16px
$sizeMedium 18px
$sizeLarge 24px
Text Weight
Variable Value
$weightThin 100
$weightLight 300
$weightBase 400
$weightBold 700
$weightHeavy 900

Animation

Mixin Defaults Description
animate(attr, speed) speed: 0.2s Set the transition style of attribute attr.
animate-none() Remove all transition styles for an element.
animate-timing-function(timing) Set the transition timing function for an element.
animation(n, dur, i, dir, f) dur: 0.4s
i: false
dir: false
f: false
Set all the animation properties.
n = name
dur = duration
i = iteration
dir = direction
f = fill mode
animation-delay(x) Set the animation delay property to x.
animation-direction(x) x: normal Set the animation direction property.
animation-duration(x) Set the animation duration property to x.
animation-fill-mode(x) x: forwards Set the animation fill mode property.
animation-iteration(x) Set the animation iteration x property.
animation-name(x) Set the animation name property.
animation-timing-function(x) x: ease-out Set the animation timing function property.
keyframes(x) Generate the animation keyframes with name x.
// Animate block on hover
.block {
   @include position(absolute, top 10px left 10px);
   @include height(50px);
   @include width(50px);
   @include background-colour($red);
   @include animate('all', 1s); // Here we attach the animation styles

   &:hover {
      @include position-set(top 20px left 20px);
   }
}

Arrow

Mixin Defaults Description
arrow(pos, clr, size) pos: bottom
clr: $white
size: 20px
Attach a CSS arrow to an element.
arrow-colour(pos, clr) pos: bottom
clr: $white
Change the colour of an elements CSS arrow.
arrow-none(clr) clr: $white Remove an elements CSS arrow
Reset the background colour.

Background

Mixin Defaults Description
background-attachment(x) x: scroll Set the background attachment property to x.
background-clip(x) x: border-box Set the background clip property to x.
background-colour(x) Set the background colour to x.
background-contain() Set the background size to contain and center position.
background-cover() Set the background size to cover and center position.
background-origin(x) x: padding-box Set the background origin property to x.
background-position(x) x: center Set the background position property to x.
background-repeat(x) x: repeat Set the background repeat property to x.
background-size(x) x: auto Set the background size property to x.
background-single() Set the background position to center
Stop the background from repeating.

Background Images

Mixin Defaults Description
background-image(url, pos) pos: top left Set the background image on an element.
background-image-contain(url, pos) pos: center Set a contained background image on an element.
background-image-cover(url, pos) pos: center Set a covered background image on an element.
background-image-parallax(url) Set a parallax style background image on an element.
background-image-single(url, pos) pos: center Set a single background image on an element.
// Set the background
.my-element {
   @include background-image-cover("global/background.png");
}

Borders

Set the border property of an element.

Mixin Defaults
border(clr, size, type) clr: $grey
size: 1px
type: solid
border-[s](clr, size, type) [s]: t r b l
clr: $grey
size: 1px
type: solid
border-horizontal(clr, size, type) clr: $grey
size: 1px
type: solid
border-vertical(clr, size, type) clr: $grey
size: 1px
type: solid
border-none()
.my-element {
   @include border-left($red, 2px);
}

Border Radius

Set the border radius property on an element.

Mixin Options & Defaults
border-radius(x) x: 2px
border-radius-[s](x) [s]: t r b l tl tr bl br
x: 2px
border-radius-none()
.my-element {
   @include border-radius-tr(4px); // This add a border radius to the top right corner.
}

Display

Mixin Defaults Description
hide() Hide an element.
hide-visually() Hide an element but still make it accessible to the DOM.
Used for instances where accessibility is needed.
show(x) x: block Show an element with display type of x.
opacity(int) int: 0.60 Set the opacity of an element.
overflow(x, direction) x: visible
direction: false
Set the overflow of an element.
direction is optional and can be vertical or horizontal.
perspective(x) x: 0px Set the perspective of an element.
transparency(int) int: 0.60 Set the transparency of an element.
You can also use the opacity mixin as an alternative.
visibility(x) x: visible Set the visibility property of an element.

Drop Shadow

Mixin Defaults Description
drop-shadow(clr, size, v, h) clr: fade-out(#000, 0.6)
size: 3px
v: 0px
h: 0px
Set the drop shadow of an element.
v is the vertical offset.
h is the horizontal offset.
drop-shadow-inset(clr, size, v, h) clr: fade-out(#000, 0.6)
size: 3px
v: 0px
h: 0px
Set an inset drop shadow of an element.
v is the vertical offset.
h is the horizontal offset.
drop-shadow-none() Remove any drop shadow.
.my-element {
   @include drop-shadow($green);
}

Global Setup

Mixin Description
global-setup() Apply the border-box property to all elements to contain dimensions. Set the default colour to a lighter, more readable black, the background colour to white and the default font to Open Sans with an Arial and Helvetica fallback. Note that this setup is automatically called by Rocket already.

Gradient

Note that the arguments x and y are the starting and ending gradient colours.

Mixin Defaults Description
gradient-animate(x, y, angle) angle: 135deg Apply animated background gradient.
gradient-animate-horizontal(x, y) Apply animated background gradient from left to right.
gradient-animate-vertical(x, y) Apply animated background gradient from top to bottom.
gradient-animate-none() Remove any animated background gradient.
gradient-angle(x, y, angle) angle: -45deg Apply background gradient.
gradient-horizontal(x, y) Apply background gradient from left to right.
gradient-vertical(x, y) Apply background gradient from top to bottom.
gradient-none() Remove any background gradient.

Interaction

Mixin Defaults Description
cursor(x) x: auto Set the cursor to x.

iOS

Mixin Description
ios-render() Set some special properties like Webkit's backface visibility and perspective property to help with rendering elements like images.

Layout

Mixin Defaults Description
box-sizing(x) x: content-box Set the box sizing style of an element.
center() Center an element within its container.
center-vertical() Center an element vertically within its container.
clearfix() Clear the zoom and set the clear style to both for the element.
level(int) int: 1 Set the z-index of an element to int.
You can also use the z-index mixin as an alternative.
vertical-align(x) Set the vertical alignment of an element to x.
z-index(int) x: 1 Set the z-index of an element to x.

Layout Flex

For information on flex visit CSS-Tricks: A Guide to Flexbox

Mixin Defaults Description
align-content(x) x: flex-start Set the align content property of a flex element.
x can be flex-start, flex-end, center,
space-between, space-around or stretch.
align-items(x) x: flex-start Set the align items property of a flex element.
x can be flex-start, flex-end, center,
space-between, space-around or stretch.
align-self(x) x: auto Set the align self property of a flex element.
x can be flex-start, flex-end, center,
space-between, space-around or stretch.
flex(grow, shrink, basis) grow: 0
shrink: 1
basis: auto
Set the all the flex properties for a flex item.
flex-basis(x) basis: auto Set the flex basis property for a flex item.
flex-direction(x) x: row Set the flex direction property of a flex element.
x can be row, row-reverse, column or column-reverse.
flex-display(x) x: normal Set the flex display property of a flex element.
flex-flow(x, y) Set the flex direction and wrap properties of a flex element.
x is direction.
y is wrap.
flex-grow(x) x: 0 Set the flex grow property of a flex element.
flex-shrink(x) x: 1 Set the flex shrink property of a flex element.
flex-wrap(x) x: nowrap Set the flex wrap property of a flex element.
x can be nowrap, wrap or wrap-reverse.
justify-content(x) x: flex-start Set the justify content property of a flex element.
x can be flex-start, flex-end, center,
space-between or space-around.
order(int) int: 0 Set the flex order property for a flex item.

Layout Floats

Mixin Description
float(x) Set the float of an element to x.
float-clear() Clear the float of an element.
float-none() Set the float of an element to none.

Layout Responsive

Mixin Defaults Description
breakpoint(x, y, z) y: false
z: false
Generate a media query based on a Rocket preset or a value.
x: large, small or an em/px value.
y: Breakpoint type of min or max
z: breakpoint orientation.
breakpoint-vertical(x, y, z) y: false
z: false
The same as breakpoint except it activates vertically.
limit(x) x: $limitWidth Assigns a maximum width to an element and centers it.
Anything below the limit will become fluid.
Used mainly to contain row elements.
offset(x, y) y: $columnLimit Push an element out x amount of columns from the left.
offset-right(x, y) y: $columnLimit Push an element x amount of columns from the right.
row() Turns an element into a row.
Row is needed to wrap any span elements.
A row element will default to a 100% width of its container.
span(x, y) y: $columnLimit Span an element x amount of columns within the z total.
See and example below.
span-new(x, y) y: $columnLimit Apply a new span amount of x to an element.
<div class="container">
   <div class="left">Left Column</div>
   <div class="right">Right Column</div>
</div>
.container {
   @include row();

   .left,
   .right {
      @include span(12); // Span of 12 is a width of 100% (12/12).
   }

   // Change the layout at the large breakpoint
   @include breakpoint ($bpLarge) {
      .left {
         @include span-new(3); // Span of 3 is a width of 25% (3/12).
      }
      .right {
         @include span-new(9); // Span of 9 is a width of 75% (9/12).
      }
   }
}

List

Mixin Defaults Description
list-style(x) x: disc outside none Set the list style.
list-style-image(url) Set the list style image.
list-style-position(x) x: outside Set the list style position.
list-style-type(x) x: disc Set the list style type.

Position

Mixin Defaults Description
position(x, opt) x: relative Set the position of an element to x.
opt is optional.
opt can include top, right, bottom, left,
margin-top, margin-right, margin-bottom and margin-left.
position-set(opt) opt can include top, right, bottom, left,
margin-top, margin-right, margin-bottom and margin-left.
.my-element {
   @include position(relative, left 10px margin-top 10px)
}

Size

Mixin Defaults Description
height(x, y, z) x: 0px
y: false
z: false
Set the height of an element.
y is the height max.
z is the height min.
height-max(x) x: 0px Set the maximum height of an element.
height-min(x) x: 0px Set the minimum height of an element.
size(x, y) x: 0px
y: 0px
Set the width x and height y of an element.
square(x) Set the width, height and line-height of an element to x.
Center the text.
width(x, y, z) x: 0px
y: false
z: false
Set the width of an element.
y is the width max.
z is the width min.
width-max(x) x: 0px Set the maximum width of an element.
width-min(x) x: 0px Set the minimum width of an element.

Spacing Margins

Mixin Defaults Description
margin(x) x: 24px Set all the margins of an element.
margin-[s](x)
x: 24px
Set the margin side of s of an element.
s can be top, right, bottom, left, horizontal, vertical.
margin-none() Set the margin of an element to 0.
.my-element {
   @include margin-b(12px);
}

Spacing Padding

Mixin Defaults Description
padding(x) x: 24px Set all the padding of an element.
padding-[s](x) x: 24px Set the padding side of s of an element.
s can be top, right, bottom, left, horizontal, vertical.
padding-none() Set the padding of an element to 0.
.my-element {
   @include padding-right(20px);
}

Spacing Remove

Mixin Description
spacing-none() Remove all margins and padding from an element.

Text

Mixin Defaults Description
text-align(x) x: left Set the text alignment of an element.
text-colour(x) x: $white Set the text colour of an element.
text-decoration(x) x: none Set the text decoration of an element.
text-ellipsis() Set text overflow to ellipsis and prevent word wrapping.
text-font(x) x: $helvetica Set the text font family of an element.
text-hide() Hide the text within an element.
text-letter-spacing(x) x: normal Set the text letter spacing of an element.
text-line-height(x) x: 16px Set the line height of an element in pixels.
Calculates an additional rem overwrite.
text-size(x) x: 16px Set the font size of an element in pixels.
Calculates an additional rem overwrite.
text-style() x: normal Set the text style of an element to $style.
text-transform(x) x: none Set the text transform property of an element to x.
x can be none, capitalize, uppercase,
lowercase or initial.
text-weight(x) x: normal Set the text weight of an element to x.

Transform

Mixin Defaults Description
transform(x) Set the transform of property x for an element.
transform-origin(x, y, z) x: 50%
y: 50%
z: 0
Set the transform origin of an element.
transform-rotate(x) x: 0deg Set the transform rotate style of an element.
transform-rotate-x(x) x: 0deg Set the transform rotate X style of an element.
transform-rotate-y(x) x: 0deg Set the transform rotate Y style of an element.
transform-rotate-z(x) x: 0deg Set the transform rotate Z style of an element.
transform-scale(x, y) x: 1
y: 1
Set the transform scale style of an element.
transform-scale-3d(x, y, z) x: 1
y: 1
z: 1
Set the transform scale3D style of an element.
transform-translate-3d(x, y, z) x: 0px
y: 0px
z: 0px
Set the transform translate3d style of an element.
transform-translate-x(x) x: 1 Set the transform translateX style of an element.
transform-translate-y(x) x: 1 Set the transform translateY style of an element.
transform-translate-z(x) x: 1 Set the transform translateZ style of an element.
transform-easing(x, y, z, s) x: 0px
y: 0px
z: 0px
s: 0.2s
Animate the translate3d transform style (ease-out).

CSS Implementation

Start by including the necessary files.

<head>
   <link href="rocket-propel/css/propel.min.css" rel="stylesheet" type="text/css">
</head>

Alternatively you can also build the SASS out if you wish to include all your CSS in one production file. See an example below.

@import "rocket-propel/build/sass/import";
@include rocket-propel-css;

Now class your HTML to manage your layout. For example:

<div class="_row">
   <div class="_span-2">Span 2</div>
   <div class="_span-2">Span 2</div>
   <div class="_span-2">Span 2</div>
   <div class="_span-2">Span 2</div>
   <div class="_span-2">Span 2</div>
   <div class="_span-2">Span 2</div>
</div>

Classes as Modifiers

Because all classes are declared on the DOM elements themselves, Propel sees them as global modifiers and such uses the _ prefix to reflect this. In the case of modules the module name would prefix the modifier but that only happens with extensions to Rocket Propel.

Find the other available classes below:

Background

Class Options Description
._back-pos-[x] [x]: top, right, bottom, left, center Set the background position of an element.
[x] is for top, right, bottom, left or center.
._back-repeat-[x] [x]: no y x Set the background repeat of an element.
[x] is for repeat no, along the Y axis or along the X axis.
._back-single Set the background of element to no repeat and centered.
._back-contain Set the background of element to no repeat and contain.
._back-cover Set the background of element to no repeat and cover.
._back-black Set the background colour to black.
._back-grey Set the background colour to medium grey.
._back-grey-light Set the background colour to light grey.
._back-white Set the background colour to white.

Display

Class Options Description
._hide Hide an element.
._hide-visually Hide an element visually.
It will still register as on the page.
._hide-large Hide an element in large view only.
._hide-small Hide an element in small view only.
._show Show an element.
._show-large Show an element in large view only.
._show-small Show an element in small view only.
._transparency-[x] [x]: 100 75 50 25 0 Set the opacity of an element.
[x] is for 100%, 75%, 50%, 25% or 0%.

Global

Class Options
._propel Apply some global styles to the HTML element of your page.

Layout

Class Options Description
._center Center an element.
._float-[x] [x]: l r Set the float property of an element to left or right.
._float-none Remove the float property from an element.
._float-clear Stop all floating elements from affecting any element following.
._valign-[x] [x]: t m b Set the vertical alignment of an element to top, middle or bottom.
<div class="_center">
   <div class="_float-r">One</div>
   <div class="_float-r">Two</div>
</div>

Layout Responsive

Class Options Description
._row Set the element to a row. Used on responsive containers
._span-[i] [i]: 1 to 12 Set width of an element within a row. The spans are base 12.
._span-large-[i] [i]: 1 to 12 Set width of an element within a row at the large breakpoint.
._span-small-[i] [i]: 1 to 12 Set width of an element within a row at the small breakpoint.
._limit Limit an elements width to 68.750em (default) and center.
._offset-[i] [i]: 1 to 12 Offset from the left by span [i]. The spans are base 12.
._offset-right-[i] [i]: 1 to 12 Offset from the right by span [i].
._offset-large-[i] [i]: 1 to 12 Offset from the left by span [i] at the large breakpoint.
._offset-large-right-[i] [i]: 1 to 12 Offset from the right by span [i] at the large breakpoint.
._offset-small-[i] [i]: 1 to 12 Offset from the left by span of [i] at the small breakpoint.
._offset-small-right-[i] [i]: 1 to 12 Offset from the right by span of [i] at the small breakpoint.
<div class="_row">
<div class="_span-12 _span-large-3">Left Column</div>
<div class="_span-12 _span-large-9">Right Column</div>
</div>

Position

Class Description
._pos-absolute Set the position of an element to absolute.
._pos-relative Set the position of an element to relative.
._pos-static Set the position of an element to static.
._pos-fixed Set the position of an element to fixed.

Sizing

Class Options Description
._block-height-[x] [x]: 10 20 50 100 200 500 1000 Set the height of an element.
[x] results in px value.
._block-width-[x] [x]: 10 20 50 100 200 500 1000 Set the width of an element.
[x] results in px value.
<div class="_block-width-10 _block-height-20">Block</div>

Spacing

Class Options Description
._mgn-[x] [x]: 1 to 10 Add [x] amount of margin all around.
._mgn-[s]-[x] [s]: t r b l
[x]: 1 to 10
Add [x] amount of margin to the [s] side of an element.
._mgn-none Remove all margins from an element.
._pad-[x] [x]: 1 to 10 Add [x] amount of padding all around.
._pad-[s]-[x] [s]: t r b l
[x]: 1 to 10
Add [x] amount of padding to the [s] side of an element.
._pad-none Remove all padding from an element.
._spacing-none Remove all padding and margins from an element.
<div class="_pad-t-10">Padding top of 10 pixels</div>
<div class="_mgn-right-10">Margin right of 8 pixels</div>

Text

Class Options Description
._txt-hide Hide the text within an element.
._txt-[x] [x]: l c r Set the text alignment to [x].
[x] is for left, center, right.
._txt-size-[x] [x]: s m n l Set the font size to [x].
._txt-weight-[x] [x]: xl l n b xb Set the font weight to [x].
._txt-light Set the font weight to light.
._txt-bold Set the font weight to bold.
._txt-normal Set the font weight and style to normal.
._txt-italics Set the font style to italics.
._txt-oblique Set the font style to oblique.
._txt-white Set the font colour to white.
._txt-grey Set the font colour to medium grey.
<div class="_txt-weight-xl">Very light text.</div>
<div class="_txt-r">Text aligned right.</div>

Author

Created and maintained by Chris Humboldt
Website: chrishumboldt.com
GitHub github.com/chrishumboldt

Copyright and License

Copyright 2019 Rocket Project

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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A lightweight SASS mixin library and responsive CSS layout engine.

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