JSFiddle - React, Tailwind, and code Playground

HTML

<label id="header-notification">0</label>

CSS

#header-notification 
{
    color: #7B6F60;
    font-size: 13px;
    font-weight: bold;
    float: left;
    text-align: center;
    vertical-align: middle;

    height: 20px;
    width: 20px;
    background-color: #E5E5E5;
    line-height: 20px;
}