JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner"></div>
</div>

CSS

div.outer {
    border-left: 50px red solid;
}
div.inner {
    width: 200px;
    height: 200px;
    border: 15px silver solid;
    border-left: 0;
}