event the save-image on long press on mobile */
        pointer-events: none;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    #ui {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      display: flex;
      justify-items: center;
      align-content: stretch;
    }
    #ui>div {
      display: flex;
      align-items: flex-end;
      flex: 1 1 auto;
    }
    .bright {
      filter: brightness(2);
    }
    #left {
   