JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>This is menu item 1</li>
    <li>Number 2</li>
    <li>Item Number 3</li>
    <li>Menu 4</li>
</ul>

CSS

ul {
    width: 100%;
    background: #cacaca;
    margin: 0;
    padding: 0;
}
li {
    list-style-type: none;
    display: inline-block;
    padding-right: 10%;
    width: auto;
    margin-right: 0.5%;
    background: #fafafa;
    padding-left: 0;
    margin-left: 0;
}
li:last-child {
    margin-right: 0;
    padding-right: 0;
}