JSFiddle - React, Tailwind, and code Playground
HTML
<input onmouseover="this.style.backgroundColor='#6ce033'; this.style.color='#FFF'; return true;" onmouseout="this.style.backgroundColor='#40c200'; this.style.color='#FFF'; return true;" type="submit">
CSS
input[type="submit"] {
font-family: FontAwesome, 'Diplomata SC', "Helvetica Neue", helvetica, arial, sans-serif;
font-weight: bold;
text-transform: uppercase;
display:block;
background-color: #333333!important;
color: #FFFFFF!important;
padding: 5px 11px;
letter-spacing: 2px;
border: none;
cursor: pointer;
font-size: 15x;
border-radius: 3px;
box-shadow: 0 -3px rgba(0, 0, 0, 0.14) inset;
}
input[type="submit"]:hover {
background-color: #27ccc0!important;
color: #FFFFFF!important;
}