._dash-loading-callback {
  position: fixed;
  z-index: 100;
  }

  ._dash-loading-callback::after {
  content: 'Loading';
  font-family: sans-serif;
  padding-top: 50px;
  color: #000;

  -webkit-animation: fadein 0.5s ease-in 1s forwards; /* Safari, Chrome and Opera > 12.1 */
     -moz-animation: fadein 0.5s ease-in 1s forwards; /* Firefox < 16 */
      -ms-animation: fadein 0.5s ease-in 1s forwards; /* Internet Explorer */
       -o-animation: fadein 0.5s ease-in 1s forwards; /* Opera < 12.1 */
          animation: fadein 0.5s ease-in 1s forwards;  
  /* prevent flickering on every callback */
  -webkit-animation-delay: 0.5s;
  animation-delay: 0.5s;

  /* The banner */
  opacity: 0;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.5);
  text-align: center;
  cursor: progress;
  z-index: 100000;
  background-image: url(https://giphy.com/gifs/mashable-3oEjI6SIIHBdRxXI40);
  background-position: center center;
  background-repeat: no-repeat;
  }

  @keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
  }

  /* Firefox < 16 */
  @-moz-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
  }

  /* Safari, Chrome and Opera > 12.1 */
  @-webkit-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
  }

  /* Internet Explorer */
  @-ms-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
  }

  /* Opera < 12.1 */
  @-o-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
  }

  .drop-down{
    width: 20%;
    margin-left: 12px;
    margin-bottom: 5px;
  }