JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
<div class="static240" style="background:red;" > </div>
  
  <div class="static160"  style="background: green;" > </div> 
  
  
	<div class="growMax"  style="background:yellow;"  ></div>
</div>

CSS

#wrapper {
		display:flex;    
    width:100%;
    align-content: streach;
    justify-content: space-between;
    height: 100px;
	}    
  
  #wrapper div {
    height:100px;
  }

	.static240 {
		flex: 0 0 240px;
	}
	.static160 {
		flex: 0 0 160px;
	}

	.growMax {
		flex-grow: 1;
	}