CSS for 4 div fixed ratio sample. place in same directory as index.html

main.css

/* apply a natural box layout model to all elements */
*, *:before, *:after {
  -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;
 }

.parent {
  background-color: #EEE;
}

.parent div {
  float: left;
  padding: 1em;
}

.image {
  width: 20%;
  background-color: #EDD;
}
.contact {
  width: 40%;
  background-color: #EED;
}
.access {
  width: 20%;
  background-color: #DDE;
}
.courses {
  width: 20%;
  background-color: #DED;
}