.lightbox-nav {
    position: relative;
    margin-bottom: 12px; /* the font-size of .btn-xs */
    height: 22px;
    text-align: center;
    font-size: 0; /* prevent the otherwise inherited font-size and line-height from adding extra space to the bottom of this div */
  }
  
  .lightbox-nav .btn-group {
    vertical-align: top;
  }
  
  .lightbox-nav .close {
    /* absolutely position this in order to center the nav buttons */
    position: absolute;
    top: 0;
    right: 0;
  }
  
  .lightbox-image-container {
    position: relative;
    text-align: center; /* center the image */
  }
  
  /* the caption overlays the top left corner of the image */
  .lightbox-image-caption {
    position: absolute;
    top: 0;
    left: 0;
    margin: 0.5em 0.9em; /* the left and right margins are offset by 0.4em for the span box-shadow */
    color: #000;
    font-size: 1.5em;
    font-weight: bold;
    text-align: left;
    text-shadow: 0.1em 0.1em 0.2em rgba(255, 255, 255, 0.5);
  }
  
  .lightbox-image-caption span {
    padding-top: 0.1em;
    padding-bottom: 0.1em;
    background-color: rgba(255, 255, 255, 0.75);
    /* pad the left and right of each line of text */
    box-shadow: 0.4em 0 0 rgba(255, 255, 255, 0.75),
      -0.4em 0 0 rgba(255, 255, 255, 0.75);
  }