JSFiddle - React, Tailwind, and code Playground

HTML

<footer>
    <div class="footer-jigsaw"></div>
    <div class="footer-wrapper">
        <nav class="navigation">
            <a href="">Fluid Column Fluid Column Fluid Column Fluid Column Fluid Column</a>
            <a href="">Fluid Column</a>
            <a href="">Fluid Column Fluid Column Fluid Column Fluid Column</a>
            <a href="">Fluid Column</a>
            <a href="">Fluid Column Fluid Column Fluid Column</a>
            <a href="">Fluid Column</a>
        </nav>
    </div>
</footer>

CSS

.navigation {
    overflow: auto;
    background: gray;   
}

.navigation a {
    width: 16.6%;
    float: left;
    display: block;
    border-bottom: 1px solid black;
}