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

.cp_h1title {
  position: relative;
  border: 1px solid #0081b2;
  border-radius: 5px;
  box-shadow: 2px 2px 0 0 #0081b2;
  padding: 5px 20px;
}
.cp_h1title::before,
.cp_h1title::after,
.cp_h1title span::before,
.cp_h1title span::after {
  position: absolute;
  content: '';
  width: 10px;
  border-top: 1px solid #0081b2;
  transform: rotate(-45deg);
}
.cp_h1title span::before,
.cp_h1title span::after {
  transform: rotate(45deg);
}
.cp_h1title::before {
  top: 10px;
  left: 5px;
}
.cp_h1title::after {
  bottom: 10px;
  right: 5px;
}
.cp_h1title span::before {
  top: 10px;
  right: 5px;
}
.cp_h1title span::after {
  bottom: 10px;
  left: 5px;
}