<h1 class="cp_h1title">見出しテキスト</h1>

.cp_h1title {
	position: relative;
	padding: .3em;
	background-color: #F9A825;
	color: #E65100;
}
.cp_h1title::before,.cp_h1title::after {
	content: '';
	position: absolute;
	border-style: solid;
	border-color: transparent;
}
.cp_h1title::before {
	top: 100%;
	left: 0;
	border-width: 0 15px 15px 0;
	border-right-color: #F57F17;
}
.cp_h1title::after {
	top: -15px;
	right: 0;
	border-style: solid;
	border-width: 0 15px 15px 0;
	border-bottom-color: #da3c3c;
}