* {
  margin: 0;
  padding: 0;
}

html {
  background: url("walrus.jpg") no-repeat center center ;
  background-color: darkgray;
  height: 100%;
  overflow: hidden;
}

@keyframes as {
  0% {
    opacity: 0;
  }
  10% {
    opacity: .3;
  }
  20% {
    opacity: .1;
  }
  30% {
    opacity: .5;
  }
  40% {
    opacity: 0;
  }
  50% {
    opacity: .8;
  }
  55% {
    opacity: 0;
  }
  55% {
    opacity: 0;
  }
}


h2 {
  z-index: 3;
  position: absolute;
  font: bold 150px/150px Arial, sans-serif;
  left: 50%;
  margin-top: 50px;
  width: 100%;
  margin-left: -50%;
  height: 200px;
  text-align: center;
}

@keyframes four-oh-four {
  0% {
    text-shadow: 0 0 30px rgba(0, 0, 0, .5);
  }
  33% {
    text-shadow: 0 0 10px rgba(0, 0, 0, .4);
  }
  66% {
    text-shadow: 0 0 20px rgba(0, 0, 0, .2);
  }
  100% {
    text-shadow: 0 0 40px rgba(0, 0, 0, .8);
  }
}
img{
  display: block;
  margin-left: auto;
  margin-right: auto;
}