### キーボード
# usage: {{keyboard('Ctrl','Alt','Del')}}
sub keyboard {
	@result = map {'<kbd>'.$_.'</kbd>'} @_;
	return join('+',@result);
}

kbd {
	color: #333333;
	background-color: white;
	text-align: center;
	border-left: 1px solid #cfcfcf;
	border-top: 1px solid #cfcfcf;
	border-right: 2px solid #666666;
	border-bottom: 2px solid #666666;
	-moz-border-radius: 4px 4px 4px 4px;
	padding-left: 2px;
	padding-top: 1px;
	padding-right: 3px;
	padding-bottom: 1px;
	margin-left: 2px;
	margin-right: 2px;
	margin-top: 1px;
	margin-bottom: 1px;
	vertical-align: middle;
	font-family: sans-serif;
}