JSFiddle - React, Tailwind, and code Playground

HTML

<div class="resp-grid">
<div class="resp-grid-hldrs">
test1
</div>
<div class="resp-grid-hldrs">
test2
</div>

<div class="resp-grid-hldrs">
test4
</div>
<div class="resp-grid-hldrs">
test5
</div>
<div class="resp-grid-hldrs">
test6
</div>
<div class="resp-grid-hldrs">
test7
</div>
<div class="resp-grid-hldrs">
test8
</div>
<div class="resp-grid-hldrs">
test9
</div>
<div class="resp-grid-hldrs">
test10
</div>
</div>

CSS

.resp-grid{
  width:300px;
  border: #f00 solid 1px;
  float: left;
}

.resp-grid-hldrs{
  width:30%;
  height: 30px;
  background-color:#f0f;
  border: #f00 solid 1px;
  float: left;
}