.body {
  background-color: #000;
}

.div-block {
  position: fixed;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  width: 100%;
  height: 100%;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -webkit-flex-direction: row;
  -ms-flex-direction: row;
  flex-direction: row;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}

.heading {
  padding: 30px;
  border: 1px solid #fff;
  font-family: 'Varela Round', sans-serif;
  font-size: 80px;
}

@media (max-width: 767px) {
  .heading {
    font-size: 60px;
  }
}

@media (max-width: 479px) {
  .heading {
    font-size: 30px;
  }
}