.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 999;
    text-align: center;
  }
  .lightbox img {
    display: block;
    margin: auto;
    max-width: 80%;
    max-height: 70%;
    margin-top: 50px;
  }
  .description {
  color: white;
  font-size: 18px;
  margin-top: 10px;
  padding: 0 60px;
}
  .arrow {
    color: white;
    position: absolute;
    top: 50%;
    cursor: pointer;
    font-size: 48px;
  }
  .left-arrow {
    left: 20px;
  }
  .right-arrow {
    right: 20px;
  }

.close-lightbox {
  color: white;
  position: absolute;
  top: 20px;
  right: 20px;
  cursor: pointer;
}

.thumbnail { cursor: pointer; }
.arrow, .close-lightbox { user-select: none; }

.is-hidden {
    display: none !important;
}

.is-block {
    display: block !important;
}

.is-flex {
    display: flex !important;
}

@media (max-width: 768px) {
    .arrow {
        top: 320px;
    }
}

/* Match the main heading size in textSK.htm and the contact page. */
h1 {
    font-family: Arial, sans-serif;
    font-size: 28px;
    line-height: 1.6;
    color: #552B00;
    text-align: center;
    margin: 20px 0;
}

@media (max-width: 800px) {
    /* Extra space after gallery thumbnails; included in the iframe height. */
    body {
        padding-bottom: 60px;
    }

    h1 {
        font-size: 24px;
    }
}