JSFiddle - React, Tailwind, and code Playground

HTML

<div class="button"></div>

CSS

.button {
    text-align: center;
    margin-bottom: 16px;
    margin: 0;
    padding: 0;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.23);
    border-radius: 50%;
    transition: all 450ms cubic-bezier(0.23, 1, 0.32, 1) 0ms;
    display: inline-block;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.16);
    background-color: #00bcd4;
    position: relative;
    height: 56px;
    width: 56px;
    padding: 0;
    overflow: hidden;
    transform: translate3d(0, 0, 0);
}
.admin__add:before {
    content:"\e604";
}