style.css

.main {
    margin-left: auto;
    margin-right: auto;
    max-width: 29rem;
}

html {
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,Helvetica,Arial,sans-serif;
    color: #4a4a4a;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
}

a {
    color: #3273dc;
    cursor: pointer;
    text-decoration: none;
    border-bottom: 2px solid rgba(50,115,220,.1);
    padding-bottom: 2px;
    font-size: 1rem;
}

a:hover {
    color: #1e57b4;
    border-bottom-color: #1e57b4;
}


::selection {
    background-color: #ffe270;
}


/* Headings !!!! */

h1, h2, h3, h4, h5, h6 
{
    font-family: archiaregular, sans-serif;
    font-weight: 600;
}

h3 {
    margin: 5px;
}

.step {
    display: none;
    padding: 2rem;
    opacity: 0;
    transition: opacity 1s, background-color 1s;
    transition-timing-function: ease-in-out;
    background-color: #ffffe0;
}

.is-active {
    opacity: 1;
    background-color: transparent;
}



/* Decorators */

.stamp {
    border-radius: 2px;
    color: hsla(0,0%,4%,.6);
    font-size: .875rem;
    line-height: 1;
    padding: .25em .5em;
    padding-top: calc(.25em + 1px);
    vertical-align: middle;
    position: absolute;
    right: calc(100% + 1rem);
    text-transform: lowercase;
}

.is-medium {
    background-color: #ffe270;
}

.is-hard {
    background-color: #ffa270;
}

.is-easy {
    background-color: #eac9ff;
}


.content h2 {
    font-size: 1.5em;
    padding-top: 0;
    position: relative;
}

.stamp {
    top: 7px;
    position: absolute;
    right: calc(100% + 1rem);
}

/* stabsssss */

.stabs {
    border: 1px solid #dbdbdb;
    box-shadow: 0 0 0 5px #f3f5f6;
    border-radius: 5px;
    counter-reset: a;
}

.stab {
    box-shadow: inset 0 -5px 10px #f3f5f6;
    counter-increment: a;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-direction: column;
    flex-direction: column;
    padding: 1em;
    position: relative;
}

.stab:not(:last-child) {
    border-bottom: 1px solid #dbdbdb;
}

.stab-label {
    -ms-flex-positive: 1;
    flex-grow: 1;
    -ms-flex-negative: 1;
    flex-shrink: 1;
    font-size: .875em;
    padding-right: 1em;
}

.stab:before {
    content: counter(a);
    font-size: .875em;
    line-height: 1.5rem;
    opacity: .5;
    position: absolute;
    right: calc(100% + 1em);
    top: 1rem;
    font-family: archiaregular, sans-serif;
    font-weight: 600;
}

.stab-item:hover {
    background-color: #ffe270;
    font-weight: 500;
    cursor: pointer;
}

.is-wrong {
    background-color: #ec5252;
    font-weight: 500;
}

.is-right {
    background-color: #00d1b2;
    font-weight: 500;
}

/*****  checkmark related  *******/

.check {
	-ms-flex-align: center;
	align-items: center;
	animation-delay: 1.2s;
	animation-duration: .29s;
	animation-name: d;
	animation-timing-function: ease-in-out;
	display: -ms-flexbox;
	display: flex;
	height: 40px;
	-ms-flex-pack: center;
	justify-content: center;
	transform-origin: center;
	width: 40px
}

@media screen and (max-width:699px) {
	.check {
		margin-bottom: 10px
	}
}

@media screen and (min-width:700px) {
	.check,
	.content h2 .stamp {
		position: absolute;
		right: calc(100% + 1rem)
	}
	.check {
		top: -5px
    }
    
}

.check-circle {
	animation-duration: 1s;
	animation-fill-mode: both;
	animation-name: b;
	animation-timing-function: cubic-bezier(0, 1, .6, 1.08);
	background-color: #87ffe1;
	border-radius: 290486px;
	height: 40px;
	transform-origin: center;
	width: 40px
}

.check-circle,
.check-svg {
	position: absolute
}

.check-svg svg {
	display: block
}

.check-svg polyline {
	animation-delay: .25s;
	animation-duration: .5s;
	animation-fill-mode: forwards;
	animation-name: c;
	stroke-dasharray: 26;
	stroke-dashoffset: 26
}

@keyframes b {
	0% {
		transform: scale(0)
	}
	to {
		transform: scale(1)
	}
}

@keyframes c {
	to {
		stroke-dashoffset: 0
	}
}

@keyframes d {
	0%,
	to {
		transform: scale(1)
	}
	50% {
		transform: scale(1.1)
	}
}

.success {
    display: none;
}


.sides {
    text-align: center;
    font-weight: 800;
    font-size: 2rem;
    font-family: archiaregular;
    box-shadow: 0 2rem 4rem -1rem rgba(0,0,0,.2);
    animation-name: b;
    display:none;
    animation-duration: .5s;
    animation-fill-mode: both;
    background-color: #fff;
    border-radius: 5px;
    bottom: 5vw;
    padding: 1rem;
    padding-right: 2rem;
    position: fixed;
    right: 5vw;
    transform-origin: bottom right;
    width: 10rem;
    z-index: 4;
}

@keyframes b {
	0% {
		transform: scale(0)
	}
	to {
		transform: scale(1)
	}
}


.error-icon {
    height:40px;
    width: 40px;
}

#scoreboard span {
    margin: 5px;
}

.modal {
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.12),0 2px 4px 0 rgba(0,0,0,0.08);
    padding: 5px;
    background: white;
    display: none;
    
}

.modal-content {
    margin: 12px;
}

.center-modal {
  position: absolute;
  margin: auto;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 600px;
  height: 200px;
}

.about {
    background: #F3F5F6;
    padding: 20px;
    font-family: archiaregular, sans-serif;
    font-size: 0.8rem;
    text-align: center;
    line-height: 1.5rem;
    margin-top: 15rem;
    display:none;
}

.about a{
    font-size: 0.8rem;
}

.cs {
    -ms-flex-align: end;
    align-items: flex-end;
    background-color: #F6CC8B;
    color: #000;
    display: -ms-inline-flexbox;
    display: inline-flex;
    height: 4rem;
    -ms-flex-pack: end;
    justify-content: flex-end;
    padding-right: 2px;
    width: 4rem;
}