<div class="fullwidth">Element 1</div>
<div class="fullwidth">Element 2</div>

/* Source Sans Pro */
@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:700);

body {
  font-family: 'Source Sans Pro', sans-serif;
  font-weight: 700;
  text-align: center;
  line-height: 100vh;
  color: white;
}

.fullwidth {
  background-color: #f76f24;
  width: 100vw;
  height: 100vh;   
}

.fullwidth:nth-child(2) {
  background-color: #faa237;
}