JSFiddle - React, Tailwind, and code Playground

HTML

<div class="m"></div>
<div class="m1"></div>
<div class="m2"></div>
<div class="clear"></div>

CSS

.m, .m1, .m2 { 
    width: 33.333%;
    float: left;
}
.m { 
 background-color: red;
 height: 100px;
}
.m1 { 
 background-color: green;
 height: 150px;
}
.m2 { 
 background-color: black;
 height: 200px;
}
div.clear{ clear: both; background-color: blue; height: 5px;}