JSFiddle - React, Tailwind, and code Playground

by Tomek

HTML

<div class="container">
    <div class="item-1"></div>
    <div class="item-2">
        <div class="item-2-dimensions-wrapper">
            <div class="item-2-child"></div>
        </div>
    </div>
</div>

CSS

.container {
    position: relative;
    height: 200px;
    width: 500px;
    display: -moz-box;
    display: -webkit-flexbox;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: -moz-flex;
    display: flex;
    -webkit-flex-direction: row;
    -moz-flex-direction: row;
    -ms-flex-direction: row;
    flex-direction: row;
}
.item-1 {
    width: 100px;
    background-color: blue;
}
.item-2 {
    position: relative;
    -moz-box-flex: 1;
    -webkit-flex: 1;
    -moz-flex: 1;
    -ms-flex: 1;
    flex: 1;
    background-color: red;
}
.item-2-dimensions-wrapper{
    position: absolute;
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
}
.item-2-child {
    height: 100%;
    width: 100%;
    background-color: green;
}