JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container clearfix">
    <div class="child">
        ABC
    </div>
    <div class="child">
        DEF
    </div>
    <div class="child">
        GHI
    </div>
</div>

CSS

.container {
    margin-top: 10px;
}
.child {
    width: 100px;
    background: #FFCCCC;
    float: left;
}
.clearfix {
  *zoom: 1;
}

.clearfix:before, .clearfix:after {
    display: table;
    content: "";
    line-height: 0;
  }

.clearfix:after {
    clear: both;
  }