JSFiddle - React, Tailwind, and code Playground

HTML

<div id='box'>
 <div id='a'>Tree</div>
 <div id='b'>View</div>
</div>

CSS

#box {
    display: flex;
    float: left;
  }
  #b {
    flex-grow: 100;
    border: 1px solid green;
  }