1 - touche de clavier en CSS
<style type="text/css">
	key{
		display:inline-block;
		padding:0.5em;
		border:1px solid rgba(0,0,0,0.5);
		border-radius: 3px;
		box-shadow: 0 0.2em 0 0.05em #222;
		background: linear-gradient(180deg, rgba(150,150,150,1) 0%, rgba(240,240,240,1) 100%);;
	}
</style>

<key>Shift</key>+<key>B</key>