JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="child">
        a<br />a<br />a
    </div>
    <div class="child">
        a<br />a<br />a<br />a<br />a<br />a<br />a
    </div>
    <div class="child">
        <div class="content">
            a<br />a<br />a
        </div>
    </div>
</div>

CSS

.container {
    display: table;
}
.child {
    width: 30px;
    background-color: red;
    display: table-cell;
    vertical-align: top;
    position:relative;
}

.content {
    position:absolute;
    top:0;
    bottom:0;
    width:100%;
    background-color: blue;
}