JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header">
    <div>
    dfjhjdfhj
    </div>
    
    <div>
    dfdfdf 
   </div>

    <div>
    dfdsfdf
    </div>
</div>

CSS

div.header {
        width:70%;
        height:100px;
        min-width:400px;
        margin:30px 15% 0;
        background-color:grey;
        display:table;
        table-layout:fixed;
        }  
        
  div.header>div {
        display:table-cell;
        border:1px solid;
        height:100%;
        padding-left: 10px;
   }