JSFiddle - React, Tailwind, and code Playground

HTML

<button>+</button><button>-</button>

CSS

button {
    font-size: 14px;
    height: 25px;
    width: 25px;
    text-align: center;
    vertical-align: middle;
    padding: 0;
    margin-left: auto;
    margin-right: auto;
}