index.css

* {
  box-sizing: border-box;
}

body {
  font-family: 'Work Sans', sans-serif;
  font-size: 20px;
  color: #444;
  text-align: center;
  line-height: 1.5;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 1% 0;
  background-color: #aaa;
}

section {
  min-height: 500px;
  padding: 10% 0;
  background-color: #bbb;
}

section:nth-child(even) {
  background-color: #ddd;
}

div{
  display: inline;
  text-align: center;
}

.div-1{
  position: relative;
  float: left;
  top: 25%;
  left: 25%;
}

.div-2 {
  position: relative;
  float: right;
  top: -25%;
  left: -25%;
}

@media (min-width: 320px) and (max-width: 480px) {
  .div-1{
    float: none;
    top: 0;
    left: 0;
    display: block;
  }
  
  .div-2 {
    float: none;
    top: 0;
    left: 0;
    display: block;
  }
}