<h1 class="cp_h1title">見出しテキスト</h1>

.cp_h1title {
	position: relative;
	padding: .3em;
	text-align: center;
}
.cp_h1title:before,.cp_h1title:after {
	content:'';
	width: 20px;
	height: 30px;
	position: absolute;
	display: inline-block;
}
.cp_h1title:before {
	border-left: solid 2px #283593;
	border-top: solid 2px #283593;
	top:0;
	left: 0;
}
.cp_h1title:after {
	border-right: solid 2px #283593;
	border-bottom: solid 2px #283593;
	bottom:0;
	right: 0;
}