JSFiddle - React, Tailwind, and code Playground

HTML

<div class="conteudo">
     <div class="esquerda"> coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>coluna1<br/>
     </div>
     <div class="direita">
         coluna2
     </div>
     <div class="clear">
     </div>
 </div>

CSS

.conteudo {
    display:table;
    width:auto;  
}

.esquerda {
    display: table-cell;
    vertical-align: top;
    width: 200px;
    background-color:#ccc;
}

.direita {
    display: table-cell;
    vertical-align: top;
    
    width: 200px;
    background-color:#ff0000;
    color:#fff;
}
.clear {
    clear: both;
}