Template:Controls/styles.css

.keyboard_button {
	background-color: #eee;
	border-top: 0.2em solid #ccc;
	border-right: 0.3em solid #aaa;
	border-bottom: 0.35em solid #888;
	border-left: 0.25em solid #bbb;
	padding: 0 0.4em 0.1em 0.3em;
	white-space: nowrap;
	line-height: 2.25em !important;
}

body.skin-darkvector .keyboard_button, 
body.skin-citizen .keyboard_button {
	color: black;
}