<button>
	<code>border-bottom: solid $bw red</code>
</button>
<button>
	<code>border: solid $bw red</code>
</button>

$bw: 1em;

button {
	display: inline-block;
	padding: 3px;
	width: 20em; height: 8em;
	border-radius: 2*$bw;
	background: #ddd;
	vertical-align: middle;
	
	&:nth-child(1) {
		border: none;
		border-bottom: solid $bw #2793c7;
	}
	&:nth-child(2) {
		border: solid $bw #2793c7;
	}
}