Edit in JSFiddle

<div class="demo demo3">
  <div class="heading"><span>毎朝ちゃんと飲むUX</span></div>
</div>

.demo {
  width: 500px;
  margin: 0 auto;
  padding: 10px 0;
  font-family: sans-serif;
  font-size: 20px;
  color:#3cb3e4;
}
.heading {
  margin: 10px 0
}
.demo3 .heading {
  color: #3cb3e4;
  text-align: center;
  overflow: hidden;
}
.demo3 .heading span {
  display: inline-block;
  position: relative;
}
.demo3 .heading span:before,
.demo3 .heading span:after {
  content: "";
  border-bottom: 2px solid #3cb3e4;
  width: 45px;
  margin: 0 15px;
  position: absolute;
  bottom: 13px;
}
.demo3 .heading span:before {
  right: 100%;
}
.demo3 .heading span:after {
  left: 100%;
}