/* section background */
#background {
  background-color: #000;
}
  #backgroundShell {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 1600px;
    height: 800px;
    margin: -400px 0 0 -800px;
  }	
    #backgroundImg {
      position: absolute;
      background: no-repeat center center;
      background-size: cover;
      width: 100%;
      height: 100%;
      visibility: hidden;
    } 
    #backgroundShell img,
    #backgroundShell video {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      visibility: hidden;
    }
    #backgroundShell img {
      z-index: 1;
    }
    #backgroundVideoTapBtn { 
      position: absolute; 
      left: 50%; 
      bottom: 48px;
      width: 160px;
      height: 20px; 
      margin: -10px 0 0 -80px; 
      font-size: 20px;
      line-height: 20px;
      letter-spacing: 2px;
      text-align: center;
      color: #c7f7ff;
      text-shadow: 0px 0px 6px #c7f7ff;
      visibility: hidden;
    }