JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header">
    </div>
    <div class="container">
</div>
    <div class="footer">
    </div>

CSS

.header{width:100%;background-color:olive;height:100px}

    .footer {
        background-color: black;
        bottom: 0;
        float: right;
        height: 30px;
        left: 0;
        margin-top: auto;
        overflow: hidden;
        position: absolute;
        width: 100%;
    }

.container{background-color: orange;height:350px;}