<h1 class="cp_headline12"><span>見出しテキスト</span></h1>

.cp_headline12 {
	position: relative;
	padding: 0.3em 0em;
	border-width: 0 0 2px 0;
	border-style: solid;
	border-color: #bdbdbd;
}
.cp_headline12 span {
	position: relative;
	padding: 0.3em 0.3em 0.3em 0.5em;
	color: #f8f8f8;
	border-width: 0 0 2px 0;
	border-style: solid;
	border-color: #424242;
	background-color: #424242;
	text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}
.cp_headline12 span::after {
	position: absolute;
	top: 0.01em;
	right: -0.49em;
	display: inline-block;
	width: 0;
	height: 0;
	content: '';
	border-width: 2em 0 0 0.5em;
	border-style: solid;
	border-color: transparent transparent transparent #bdbdbd;
}