darktable_to_lightgallery/res/css/lg-video.css

.lg-outer .lg-video-cont {
  text-align: center;
  display: inline-block;
  vertical-align: middle;
  position: relative;
}

.lg-outer .lg-video-cont .lg-object {
  width: 100% !important;
  height: 100% !important;
}

.lg-outer .lg-has-iframe .lg-video-cont {
  -webkit-overflow-scrolling: touch;
  overflow: auto;
}

.lg-outer .lg-video-object {
  position: absolute;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  top: 0;
  bottom: 0;
  z-index: 3;
}

.lg-outer .lg-video-poster {
  z-index: 1;
}

.lg-outer .lg-has-video .lg-video-object {
  opacity: 0;
  will-change: opacity;
  -webkit-transition: opacity 0.3s ease-in;
  -o-transition: opacity 0.3s ease-in;
  transition: opacity 0.3s ease-in;
}

.lg-outer .lg-has-video.lg-video-loaded .lg-video-poster,
.lg-outer .lg-has-video.lg-video-loaded .lg-video-play-button {
  opacity: 0 !important;
}

.lg-outer .lg-has-video.lg-video-loaded .lg-video-object {
  opacity: 1;
}

@keyframes lg-play-stroke {
  0% {
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
  }
  50% {
    stroke-dasharray: 89, 200;
    stroke-dashoffset: -35px;
  }
  100% {
    stroke-dasharray: 89, 200;
    stroke-dashoffset: -124px;
  }
}

@keyframes lg-play-rotate {
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

.lg-video-play-button {
  width: 18%;
  max-width: 140px;
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  cursor: pointer;
  transform: translate(-50%, -50%) scale(1);
  will-change: opacity, transform;
  -webkit-transition: -webkit-transform 0.25s cubic-bezier(0.17, 0.88, 0.32, 1.28), opacity 0.1s;
  -moz-transition: -moz-transform 0.25s cubic-bezier(0.17, 0.88, 0.32, 1.28), opacity 0.1s;
  -o-transition: -o-transform 0.25s cubic-bezier(0.17, 0.88, 0.32, 1.28), opacity 0.1s;
  transition: transform 0.25s cubic-bezier(0.17, 0.88, 0.32, 1.28), opacity 0.1s;
}

.lg-video-play-button:hover .lg-video-play-icon-bg,
.lg-video-play-button:hover .lg-video-play-icon {
  opacity: 1;
}

.lg-video-play-icon-bg {
  fill: none;
  stroke-width: 3%;
  stroke: #fcfcfc;
  opacity: 0.6;
  will-change: opacity;
  -webkit-transition: opacity 0.12s ease-in;
  -o-transition: opacity 0.12s ease-in;
  transition: opacity 0.12s ease-in;
}

.lg-video-play-icon-circle {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  fill: none;
  stroke-width: 3%;
  stroke: rgba(30, 30, 30, 0.9);
  stroke-opacity: 1;
  stroke-linecap: round;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
}

.lg-video-play-icon {
  position: absolute;
  width: 25%;
  max-width: 120px;
  left: 50%;
  top: 50%;
  transform: translate3d(-50%, -50%, 0);
  opacity: 0.6;
  will-change: opacity;
  -webkit-transition: opacity 0.12s ease-in;
  -o-transition: opacity 0.12s ease-in;
  transition: opacity 0.12s ease-in;
}

.lg-video-play-icon .lg-video-play-icon-inner {
  fill: #fcfcfc;
}

.lg-video-loading .lg-video-play-icon-circle {
  animation: lg-play-rotate 2s linear 0.25s infinite, lg-play-stroke 1.5s ease-in-out 0.25s infinite;
}

.lg-video-loaded .lg-video-play-button {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.7);
}