Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

Round columns without width adjusted and border divs inserted
<div style="background-color: yellow;">
    <div style="float: left;width: 65%;"><div style="width: 100%; height: 100%;border: 1px solid red;">column acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn acolumn a</div></div>
  <div style="float: right;width: 35%;"><div style="width: 100%; height: 100%;border: 1px solid red;">column a</div></div>
  <div style="clear: both;"></div>
</div>

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