JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
<div class="x">xasdfasdfasdf</div>
<div class="y">y</div>
<div class="z">z</div>
</div>

CSS

.outer {
    border: 1px solid black;
    overflow: scroll-x;
    
    display:table;
}
    
.x {
    width: auto;
    border: 1px solid red;
    display:table-cell;
}
        
.y {
    width: 400px;
    border: 1px solid yellow;
    display:table-cell;
}
        
.z {
    width: 400px;
    border: 1px solid blue;
    display:table-cell;
}