<h1 class="cp_h1title">見出しテキスト</h1>

.cp_h1title {
	position: relative;
	display: inline-block;
	width: 100%;
	padding: 0 17%;
	text-align: center;
	color:#00acc1;
}
.cp_h1title::before,
.cp_h1title::after {
	content: '';
	position: absolute;
	top: 50%;
	display: inline-block;
	width: 15%;
	height: 3px;
	border-top: 3px solid #00acc1;
}
.cp_h1title::before {
	left:0;
}
.cp_h1title::after {
	right: 0;
}