<h1 class="cp_h1title">見出しテキスト</h1>
.cp_h1title {
position: relative;
padding: .3em;
zoom: 1;
background: #F8BBD0;
box-shadow:0 1px 3px rgba(0,0,0,0.4);
color: #D81B60;
}
.cp_h1title:before,
.cp_h1title:after {
content: "";
position: absolute;
top: 100%;
height: 0;
width: 0;
border: 8px solid transparent;
border-top: 8px solid #EC407A;
}
.cp_h1title:before {
right: 0;
border-left: 8px solid #EC407A;
}
.cp_h1title:after {
left: 0;
border-right: 8px solid #EC407A;
}