<h1 class="cp_h1title">見出しテキスト</h1>

.cp_h1title {
	position: relative;
	padding: .1em .3em .1em 1.5em;
	background: #90CAF9;
	border-radius: 4px;
	color:#ffffff;
}
.cp_h1title:before,.cp_h1title:after {
	content: "";
	position: absolute;
	display: block;
}
.cp_h1title:before{
	top: -0.1em;
	left: 0.5em;
	width: 20px;
	height: 23px;
	padding: 5px 0 0 0;
	background: #1976D2;
	text-align: center;
}
.cp_h1title:after{
	top: .35em;
	left: .5em;
	width: 0;
	height: 0;
	border: 10px solid;
	border-color: transparent #1976D2;
}