JSFiddle - React, Tailwind, and code Playground

HTML

<button class="btncicle" >+</button>

CSS

.btncicle {
    border-radius: 50%;
    width:15px;
    height:15px;
    padding: 0px;
    text-align:center; 
    vertical-align:middle;
    line-height: 15px;
}