<div class="cp_h1title"><span>サブテキスト</span><h1>見出しテキスト</h1></div>

.cp_h1title {
	margin-top: 1em;
	padding: 5px;
	text-align: center;
	border: 1px solid #29B6F6;
}
.cp_h1title h1 {
	margin: 10px 0
}
.cp_h1title span {
	transform: translate(0, -50%);
	overflow: hidden;
	position: absolute;
	font-size: 0.8em;
	left: 0%;
	right: 0%;
	width: 35%;
	top: 44px;
	margin: 0 auto;
	background: #fafcfc;
}
.cp_h1title span:before,.cp_h1title span:after {
	content: "";
	position: absolute;
	width: 35%;
	top: 50%;
}
.cp_h1title span:before {
	transform: translate(-100%, 0);
	margin-left: -30px;
}
.cp_h1title span:after {
	margin-left: 30px;
}