<div class="heading" data-title="Heading">Heading</div>

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: tahoma;
}

.heading {
  position: relative;
  z-index: 0;
  font-size: 30px;
  font-weight: bold;
  line-height: 30px;
}

.heading:after {
  content: attr(data-title);
  position: absolute;
  left: 0;
  bottom: 0;
  font-size: 60px;
  line-height: 60px;
  opacity: 0.1;
  z-index: -1;
}