CSS height Property - Playground Example

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.primer1 {
   width: 25px; 
   height: 25px; 
   background: orange; 
}
.primer2 {
   width: 50px; 
   height: 50px; 
   background: khaki; 
}
.primer3 {
   width: 75px;
   height: 75px; 
   background: pink;
}
.primer4 {
   width: 100px;
   height: 75px;
   background: blue; 
}
.primer5 {
   width: 125px; 
   height: 75px;
   background: lime; 
}
</style>
</head>
<body>
<div class="primer1"></div> 
<div class="primer2"></div> 
<div class="primer3"></div> 
<div class="primer4"></div> 
<div class="primer5"></div>
</body>
</html>