<h1 class="cp_h1title">見出しテキスト</h1>

.cp_h1title {
  position: relative;
  text-align: center;
  padding: 0px 30px;
}
.cp_h1title::before,
.cp_h1title::after {
  position: absolute;
  content: '';
  background: #063b40;
  top: 0;
  width: 40px;
  height: 100%;
  clip-path: polygon(0% 0%, 0% 100%, 20% 100%, 5% 80%, 1% 50%, 5% 20%, 20% 0);
}
.cp_h1title::before {
  left: 0;
}
.cp_h1title::after {
  right: 0;
  transform: rotate(180deg);
}