Edit in JSFiddle

<div class="demo demo8">
  <div class="heading">毎朝ちゃんと飲むUX</div>
</div>

.demo8 .heading {
  overflow: hidden;
  align-items: center;
  background: #3cb3e4;
  color: #fff;
  height: 40px;
  line-height: 40px;
  display: flex;
}
.demo8 .heading:before,
.demo8 .heading:after {
  content: "";
  flex: 1;
  background: #fff;
  padding: 3px 0;
  height: 0;
  transform: rotate(45deg);
  }
}