_lightbox.scss

/*!
 * Reflection Theme
 */

.lightbox {
  background: rgba(255,255,255,0.8);
  width: 100%;
  height: 100%;
  position: relative;

  amp-img {
    margin: auto;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: auto;
    padding: 20px;
  }
}

.-amp-image-lightbox-viewer::after {
  display: block;
  background-color: #000;
  width: 24px;
  height: 24px;
  position: absolute;
  top: 0;
  right: 0;
}