JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div class="left"></div>
    <div class="rest"></div>
</div>

CSS

#container {
    width:50%;
    height: 50px;
    background-color: red;
    min-width: auto;
}
.left {
    position: relative;
    float: left;
    width: 90px;
    height: 100%;
    background: blue;
}
.rest {
    display: block;
    height: 100%;

    background: yellow;
}