<h1 class="cp_h1title">見出しテキスト</h1>

.cp_h1title {
	position: relative;
	padding: .3em;
	text-align: center;
}
.cp_h1title:before {
	content: "";
	position: absolute;
	top: -20%;
	left: 50%;
	width: 150px;
	height: 130%;
	border-radius: 50%;
	border: 5px solid #F48FB1;
	border-left-color: transparent;
	border-right-color: transparent;
	transform: translateX(-50%);
}