forgejo/web_src/css/features/imagediff.css

.image-diff-container {
  text-align: center;
  padding: 1em 0;
}

.image-diff-container img {
  border: 1px solid var(--color-primary-light-7);
  background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAG0lEQVQYlWN4+vTpf3SMDTAMBYXYBLFpHgoKAeiOf0SGE9kbAAAAAElFTkSuQmCC") right bottom var(--color-primary-light-7);
}

.image-diff-container .before-container {
  border: 1px solid var(--color-red);
  display: block;
}

.image-diff-container .after-container {
  border: 1px solid var(--color-green);
  display: block;
}

.image-diff-container .diff-side-by-side .side {
  display: inline-block;
  line-height: 0;
  vertical-align: top;
  margin: 0 1em;
}

.image-diff-container .diff-side-by-side .side .side-header {
  font-weight: var(--font-weight-semibold);
}

.image-diff-container .diff-swipe {
  margin: auto;
}

.image-diff-container .diff-swipe .swipe-frame {
  position: absolute;
}

.image-diff-container .diff-swipe .swipe-frame .before-container {
  position: absolute;
}

.image-diff-container .diff-swipe .swipe-frame .swipe-container {
  position: absolute;
  right: 0;
  display: block;
  border-left: 2px solid var(--color-secondary-dark-8);
  height: 100%;
  overflow: hidden;
}

.image-diff-container
  .diff-swipe
  .swipe-frame
  .swipe-container
  .after-container {
  position: absolute;
  right: 0;
}

.image-diff-container .diff-swipe .swipe-frame .swipe-bar {
  position: absolute;
  height: 100%;
  top: 0;
  left: 0;
}

.image-diff-container .diff-swipe .swipe-frame .swipe-bar .handle {
  background: var(--color-secondary-dark-8);
  left: -5px;
  height: 12px;
  width: 12px;
  position: absolute;
  transform: rotate(45deg);
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.image-diff-container .diff-swipe .swipe-frame .swipe-bar .top-handle {
  top: -12px;
}

.image-diff-container .diff-swipe .swipe-frame .swipe-bar .bottom-handle {
  bottom: -14px;
}

.image-diff-container .diff-overlay {
  margin: 0 auto;
}

.image-diff-container .diff-overlay .overlay-frame {
  margin: 0 auto;
  position: relative;
}

.image-diff-container .diff-overlay .before-container,
.image-diff-container .diff-overlay .after-container {
  position: absolute;
}

.image-diff-container .diff-overlay input {
  max-width: 300px;
}