JSFiddle - React, Tailwind, and code Playground

HTML

<div class="navmain">
</div>

CSS

div.navmain{
    float: left;
    height: 100px;
    margin-top: 100px;
    margin-left: 0px;
    width: 30%;
    margin-right: 0px;
    left: 0px;
    right: 0px;
    border-top-width: 0px;
    border-right-width: 0px;
    border-bottom-width: 0px;
    border-left-width: 0px;
    background-color: #000;
    }