*{
      margin: 0;
      margin-top: 0;
      padding: 0;
    }

html { 
  background: url(../imgs/AlexGrey.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}