JSFiddle - React, Tailwind, and code Playground

HTML

<button class="default">Hello</button>

CSS

button {
    position: relative;
    min-width: 44px;
    margin-right: 5px;
    padding: 2px 6px;
    font-size: 13px;
    font-weight: bold;
    color: #4f4f4f;    
    background: #ddd;
    background: -webkit-gradient(linear, left top, left bottom, from(#f5f6f6), to(#dbdbdb));
    background: -moz-linear-gradient(top, #f5f6f6, #dbdbdb);
    border: 1px solid #999;    
    border-bottom-color: #888;
    transition: all .2s ease-in-out;
    -webkit-transition: all .2s ease-in-out;
    -moz-transition: all .2s ease-in-out;
    -o-transition: all .2s ease-in-out;
    cursor: pointer;
    }
    button:hover,
    button:focus {
        box-shadow: 0 0 7px rgba(0,0,0,0.4);
        -webkit-box-shadow: 0 0 7px rgba(0,0,0,0.4);
        -moz-box-shadow: 0 0 7px rgba(0,0,0,0.4);
        }
    button:active {
        background: #ccc;
        background: -webkit-gradient(linear, left top, left bottom, from(#c3c3c3), to(#ebebeb));
        background: -moz-linear-gradient(top, #c3c3c3, #ebebeb);
        border-color: #a6a6a6;
        border-top-color: #939393;
        border-bottom-color: #bcbcbc;
        box-shadow: none;
        -webkit-box-shadow: none;
        -moz-box-shadow: none;
        -o-box-shadow: none;
        }
button.default {
    color: white;
    background: #5B74A8;
    border-color: #29447E #29447E #1A356E;
    background-position: 0px -48px;

    }