This is what goes on HTML:
<div>
<div class="green vertical"></div>
<div class="white vertical"></div>
<div class="green vertical"></div>
</div>
This is what goes on CSS:
.vertical {
width: 75px;
height: 150px;
float: left;
}
.green {
background-color: #589f58;
}
.white {
background-color: #ffffff;
}