style.css

/*
  Theme Name: customizer-hero
  Theme URI: https://iamsteve.me
  Author: Steve McKinney
  Author URI: https://iamsteve.me
  Description: This theme is purely to demonstrate editing a specific area of a website with customizer. It's not a fully functional theme in anyway. You can take the contents and generally drop them in with your theme.
  Version: 1.0.0
  Text Domain: customizer-hero
*/

/* Reset 
 * --------------------------- */
html { -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%; box-sizing: border-box; }
*, *:before, *:after { box-sizing: inherit; }
body { margin: 0; }
a { background: transparent; text-decoration: none; }
a:active, a:hover { outline: 0; }
img { border: 0; }
input, button, textarea, select { -webkit-appearance: none; -moz-appearance: none; }
h1, h2, h3, h4, h5, h6, p { margin-top: 0; }

/* Colour reference
 * --------------------------- */
.light-blue { color: #c3f2f5; }
.dark-purple { color: #4e3e68; }
.light-purple { color: #6a6384; }
.orange { color: #f96f52; }
.shadow { color: rgba(0, 70, 75, .2); }
  
/* Basic setup 
 * --------------------------- */
body {
  color: #6a6384;
  background-color: #c3f2f5;
  font-size: 100%;
  font-family: 'Merriweather', Georgia, serif;
  line-height: 1.5; }

/* Hero 
 * --------------------------- */
.hero {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  justify-content: center;
  min-height: 100vh; }

/* Hero content
 * --------------------------- */
.hero-content {
  padding: 12px;
  max-width: 192px; }

@media (min-width: 502px) {
  .hero-content {
    padding: 24px;
    flex: 1 1 50%;
    max-width: 416px; } }
    
/* Hero title
 * --------------------------- */
.hero-title {
  color: #4e3e68;
  font: 800 24px/1 'Raleway', Helvetica, Arial, sans-serif;
  letter-spacing: -.025em;
  margin-bottom: 12px; }

@media (min-width: 502px) {
  .hero-title {
    font-size: 30px; } }

@media (min-width: 560px) {
  .hero-title {
    font-weight: 900;
    font-size: 36px; } }

@media (min-width: 720px) {
  .hero-title {
    font-size: 48px; } }

/* Hero description
 * --------------------------- */
.hero-description {
  font-size: 12px; }

.hero-description p {
  -webkit-hyphens: auto;
  hyphens: auto;
  margin-bottom: 12px; }

.hero-description p:last-child {
  margin-bottom: 0; }

@media (min-width: 502px) {
  .hero-description {
    font-size: 14px; } }

@media (min-width: 720px) {
  .hero-description {
    font-size: 18px; } }

/* Hero image
 * --------------------------- */
.hero-image {
  flex: 1 1 40%;
  max-width: 540px;
  overflow: hidden; }

.hero-image img {
  display: block;
  width: 540px;
  height: auto; }
    
/* Button
 * --------------------------- */
.button {
  display: inline-block;
  padding: 9px 24px;
  font: 700 12px/normal 'Raleway', sans-serif;
  color: #fff;
  background-color: #f96f52;
  box-shadow: inset 0 0 0 2px #4e3e68, 0 4px rgba(0, 70, 75, .2);
  border-radius: 40px;
  transition: .2s ease-in; }

.button:hover,
.button:focus {
  background-color: #f9524e; }

.button:active {
  box-shadow: inset 0 0 0 2px #4e3e68; }

@media (min-width: 502px) {
  .button {
    font-size: 14px;
    padding: 11px 32px; } }

@media (min-width: 720px) {
  .button {
    font-size: 18px;
    padding: 13px 36px 14px; } }