body,
html {
  height: 100%;
}

.bg {
  /* The image used */
  background-image: url("semaprog.png");

  /* Full height */
  height: 100%;

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
.centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
h1 {
  color: #ffe600;
  font-size: 8em;
  text-align: center;
}