<!DOCTYPE html>
<style>
div {
   background-color: green;
   width: 120px;
   margin-bottom: 20px;
}

</style>
<div style="height: 50px;"></div>
<div style="height: 100px;"></div>
<div style="height: 200px;"></div>
<div style="height: 50px;"></div>
<div style="height: 50px;"></div>
<div style="height: 50px;"></div>