@import url('https://fonts.googleapis.com/css?family=Open+Sans:400,700');
@import url('https://fonts.googleapis.com/css?family=Merriweather:400,700');

body {
  background-color: white;
  font-family: "Open Sans", sans-serif;
  font-size: 18px;
  margin: 5px;
  color: #444;
  text-align: center;
}

*{ box-sizing: border-box; }

#wrapper {
  position: relative;
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  background-color: pink;
  height: 300px;
  
}

#bluebox {
  position: absolute;
  right:0px;
  top:0px;
  background-color:blue;
  width:140px;
  height:80px;
  opacity: .75;
}

#redbox {
  position: absolute;
  left:0px;
  top:0px;
  background-color:red;
  width:75px;
  height:80px;
  opacity: .75;
}

#greenbox {
  position: absolute;
  left:0px;
  bottom:0px;
  background-color:green;
  width:140px;
  height:80px;
  opacity: .75;
}

#yellowbox {
  position: absolute;
  right:0px;
  bottom:0px;
  background-color:yellow;
  width:75px;
  height:80px;
  opacity: .75;
}