h1 {
  text-align: center;
}

h1::after {
  background-color: #f45f2a;
  bottom: -10px;
  content: "";
  display: block;
  height: 3px;
  position: relative;
  left: -10px;
  right: 0;
  margin: auto;
  width: 200px;
  text-align: center;
}