iframe {
    width: 80%;
    height: 60%;
    margin: 0 auto;
    background-color: #777;
    display:block;
  }
  .parallax { 
    /* The image used */
    background-image: url("../images/World-of-warcraft.jpg");
  
    /* Set a specific height */
    height: 1000px;
    min-height: 100% ;
  
    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
  }