html { 
  background: url(skyline.png) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
    background-color: rgba(255, 255, 255, .2);
    background-blend-mode: lighten;
}

h1 {
    font-size: 5em;
    margin: 0;
    padding: 0;
    text-align: center;
    font-family: clean;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%); 
}

@font-face {
  font-family: clean;
  src: url(Gidole-Regular.otf);
}