#background {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: url("../thumbnail.jpg");
        background-size: cover;
        z-index: -1;
      }

      #video-container {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: black;
        z-index: 9999;
      }
      #video {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 100%;
        height: auto;
      }
      #button {
        display: block;
        margin: auto;
        position: absolute;
        top: 80%;
        bottom: 0;
        left: 0;
        right: 0;
        width: 200px;
        height: 53px;
        background-image: url('../img/top/go.png');
        background-size: contain;
        background-repeat: no-repeat;
        z-index: 9998;
      }