/***
      Styles below are only required if you're using <iframe> fallback in
      addition to HTML5 drag & drop (only working in Firefox/Chrome).
     ***/

    /* Essential FileDrop zone element configuration: */
    .fd-zone {
      position: relative;
      overflow: hidden;
      /* The following are not required but create a pretty box: */
      width: 15em;
      margin: 0 auto;
      text-align: center;
    }

    /* Hides <input type="file"> while simulating "Browse" button: */
    .fd-file {
      opacity: 0;
      font-size: 118px;
      position: absolute;
      right: 0;
      top: 0;
      z-index: 1;
      padding: 0;
      margin: 0;
      cursor: pointer;
      filter: alpha(opacity=0);
      font-family: sans-serif;
    }

    /* Provides visible feedback when use drags a file over the drop zone: */
    .fd-zone.over { border-color: maroon; background: #eee; }