JSFiddle - React, Tailwind, and code Playground

HTML

<div id='outer'>
    <div class='inner'>1</div>
    <div class='inner'>2</div>
    <div class='inner'>3</div>
    <div class='inner'>4</div>
    <div class='inner'>5</div>
    <br class='c' />
</div>

CSS

#outer {
  border:1px solid black;
  width:100%;  
}

.inner {
  border:1px solid red;
  float:left;
    margin:0 0px 0 0px;
  width:20%;   
}

.c { clear:both; }