changedetection.io/changedetectionio/static/styles/scss/diff-image.scss

/**
 * Image Comparison Diff Styles
 * Styles for the interactive image comparison slider and screenshot diff visualization
 */

.comparison-score {
  padding: 1em;
  background: var(--color-table-stripe);
  border-radius: 4px;
  margin: 1em 0;
  border: 1px solid var(--color-border-table-cell);
  color: var(--color-text);
}

.change-detected {
  color: #d32f2f;
  font-weight: bold;
}

.no-change {
  color: #388e3c;
  font-weight: bold;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1em;
  margin: 1em 1em;

  @media (max-width: 1200px) {
    grid-template-columns: 1fr;
  }
}

/* Interactive Image Comparison Slider */
.image-comparison {
  position: relative;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--color-border-table-cell);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  user-select: none;

  img {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    border: none;
    box-shadow: none;
  }
}

/* Image wrappers with checkered background */
.comparison-image-wrapper {
  position: relative;
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  /* Very light checkered background pattern */
  background-color: var(--color-background);
  background-image:
    linear-gradient(45deg, var(--color-table-stripe) 25%, transparent 25%),
    linear-gradient(-45deg, var(--color-table-stripe) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--color-table-stripe) 75%),
    linear-gradient(-45deg, transparent 75%, var(--color-table-stripe) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.comparison-after {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  clip-path: inset(0 0 0 50%);
}

.comparison-slider {
  position: absolute;
  top: 0;
  left: 50%;
  width: 4px;
  height: 100%;
  background: #0078e7;
  cursor: ew-resize;
  transform: translateX(-2px);
  z-index: 10;
}

.comparison-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 48px;
  height: 48px;
  background: #0078e7;
  border: 3px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: ew-resize;
  transition: top 0.1s ease-out;

  &::after {
    content: '⇄';
    color: white;
    font-size: 24px;
    font-weight: bold;
    pointer-events: none;
  }
}

.comparison-labels {
  position: absolute;
  top: 10px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 0px;
  z-index: 5;
  pointer-events: none;
}

.comparison-label {
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 0.5em 1em;
  border-radius: 4px;
  font-size: 0.9em;
  font-weight: bold;
}

.screenshot-panel {
  text-align: center;
  background: var(--color-background);
  border: 1px solid var(--color-border-table-cell);
  border-radius: 4px;
  padding: 1em;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);

  h3 {
    margin: 0 0 1em 0;
    font-size: 1.1em;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-background-button-primary);
    padding-bottom: 0.5em;
  }

  &.diff h3 {
    border-bottom-color: #d32f2f;
  }

  img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--color-border-table-cell);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }
}

.version-selector {
  display: inline-block;
  margin: 0 0.5em;

  label {
    font-weight: bold;
    margin-right: 0.5em;
    color: var(--color-text);
  }
}

#settings {
  background: var(--color-background);
  padding: 1.5em;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  margin-bottom: 2em;
  border: 1px solid var(--color-border-table-cell);

  h2 {
    margin-top: 0;
    color: var(--color-text);
  }
}

.diff-fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.edit-link {
  float: right;
  margin-top: -0.5em;
}

.comparison-description {
  color: var(--color-text-input-description);
  font-size: 0.9em;
  margin-bottom: 1em;
}

.download-link {
  color: var(--color-link);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-size: 0.85em;

  &:hover {
    text-decoration: underline;
  }
}

.diff-section-header {
  color: #d32f2f;
  font-size: 0.9em;
  margin-bottom: 1em;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1em;
}

.comparison-history-section {
  margin-top: 3em;
  padding: 1em;
  background: var(--color-background);
  border: 1px solid var(--color-border-table-cell);
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);

  h3 {
    color: var(--color-text);
  }

  p {
    color: var(--color-text-input-description);
    font-size: 0.9em;
  }
}

.history-changed-yes {
  color: #d32f2f;
  font-weight: bold;
}

.history-changed-no {
  color: #388e3c;
}