html,body {
  width: 100%;
  height: 100%;
  color: #000;
  background-color: #FFF;
}
.center {
  top: 50%;
  left: 50%;
  width: 100%;
  max-width: 500px;
  text-align: center;
  position: absolute;
  transform: translate(-50%, -50%);
}
.responsive {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
h1 {
  font-size: 4rem;
  text-transform: uppercase;
}