JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
</head>
<body>
    <div>
        TEST
    </div>
    <div>
        <input type="textarea" class="input"/>
    </div>
</body>
</html>

CSS

div {
    width: 200px;
    background-color: yellow;
}

div.row {
    display: table-row;
}

div.cell {
    display: table-cell;
    background-color: yellow;
}

.input {
     width: 100%; 
    box-sizing: border-box;
}