JSFiddle - React, Tailwind, and code Playground

HTML

<div id="menu"></div>

<div id="menu-2"></div>

CSS

#menu {
    height:38px;
    width: 50px;
    padding-top:0px;
    background-color:blue;
    position: absolute;
    top: 19px;
    left: 500px;
    margin-right: -50%;
    transform: translate(-50%, -50%) 
    }

#menu-2 {
    height:38px;
    width: 50px;
    margin-left: auto;
    margin-right: auto;
    background-color: red;

    }