JSFiddle - React, Tailwind, and code Playground

HTML

<div class="margins">Hey</div>
<div class="margins">Hey</div>
<div class="margins">Hey</div>
<div class="margins">Hey</div>

CSS

.margins, .float{
  margin-top:0px;
  margin-bottom:10px;
  background-color:#ccc;
}