<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;
}