<h1 class="cp_h1title"><span>見出しテキスト</span></h1>

.cp_h1title {
  position: relative;
  text-align: center;
  height: 50px;
  overflow: hidden;
}
.cp_h1title:before,
.cp_h1title:after {
  position: absolute;
  top: 0;
  display: block;
  width: 20px;
  height: 48px;
  content: '';
  border: 1px solid #00897b;
}
.cp_h1title:after {
  right: 0px;
}
.cp_h1title span:before,
.cp_h1title span:after {
  position: absolute;
  content: '';
  display: block;
  width: 30px;
  height: 2.5em;
  background: #fafcfc;
  border-right: 1px solid #00897b;
}
.cp_h1title span:before {
  left: 8px;
  top: -20px;
  transform: rotate(160deg);
}
.cp_h1title span:after {
  right: 12px;
  top: -20px;
  transform: rotate(340deg);
  z-index: 1;
}