<h1 class="cp_headline12"><span>見出しテキスト</span></h1>
.cp_headline12 {
position: relative;
padding: 0.3em 0em;
border-width: 0 0 2px 0;
border-style: solid;
border-color: #bdbdbd;
}
.cp_headline12 span {
position: relative;
padding: 0.3em 0.3em 0.3em 0.5em;
color: #f8f8f8;
border-width: 0 0 2px 0;
border-style: solid;
border-color: #424242;
background-color: #424242;
text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}
.cp_headline12 span::after {
position: absolute;
top: 0.01em;
right: -0.49em;
display: inline-block;
width: 0;
height: 0;
content: '';
border-width: 2em 0 0 0.5em;
border-style: solid;
border-color: transparent transparent transparent #bdbdbd;
}