v1/web/themes/contrib/gin/styles/components/settings.scss

// Settings: Custom accent color selector.
[data-drupal-selector="edit-preset-accent-color"] {
  .form-radios {
    display: flex;
    flex-wrap: wrap;
    margin-top: var(--gin-spacing-xs);

    .form-item--preset-accent-color {
      position: relative;

      input {
        cursor: pointer;
        width: 32px;
        height: 32px;
        top: var(--gin-spacing-m);
        margin-right: var(--gin-spacing-xs);
        border-color: transparent;

        &,
        .gin--dark-mode & {
          background-color: var(--gin-color-primary);
        }

        &:hover {
          box-shadow: none;
        }

        &:hover,
        &:focus,
        &:focus:hover,
        &:checked {
          border-color: var(--gin-color-primary);
        }

        &:focus:checked,
        &:focus,
        &:checked {
          background-color: var(--gin-color-primary);
          box-shadow: inset 0 0 0 2px var(--gin-bg-layer),
                      inset 0 0 0 4px var(--gin-color-primary);
        }

        // Custom
        &[data-gin-accent="custom"] {
          background-color: #fff;
          background-image: url(~settings/custom-color.jpg);
          background-size: 100%;
          background-repeat: no-repeat;
          border-color: var(--gin-border-color);

          &:checked {
            background-color: #fff;
            border-color: var(--gin-border-color);
            border-width: 1px;
          }
        }
      }

      .form-item__label {
        display: none;
        visibility: hidden;
        z-index: 1;
        position: absolute;
        top: 100%;
        left: -10px;
        padding: var(--gin-spacing-xs);
        color: var(--gin-color-contextual-text);
        background: var(--gin-color-contextual);
        border-radius: var(--gin-border-xs);
        transform: translateX(-50%);
      }

      &:hover .form-item__label,
      input:active ~ .form-item__label,
      input:focus ~ .form-item__label {
        display: block;
        visibility: visible;
      }
    }
  }
}

// Groups
[data-drupal-selector="edit-accent-group"],
[data-drupal-selector="edit-focus-group"] {
  .form-type--color,
  .form-type--textfield {
    float: left;
    margin: 0 0 0var(--gin-spacing-xs) 0;
  }

  .form-type--color {
    margin-right: var(--gin-spacing-xs);
  }

  .fieldset__description {
    clear: both;
  }
}

// Darkmode
[data-drupal-selector="edit-enable-darkmode"] {
  .form-radios {
    display: inline-flex;
    flex-wrap: wrap;
    padding: .1875rem var(--gin-spacing-xs);
    border: 1px solid var(--gin-border-color-form-element);
    border-radius: var(--gin-spacing-xl);

    .gin--dark-mode & {
      background: var(--gin-bg-layer2);
    }

    .form-type--radio {
      margin-top: 0;
      margin-left: 0;
      margin-bottom: 0;
    }

    .form-item__label {
      display: inline-block;
      padding: .375rem var(--gin-spacing-m);
      margin: var(--gin-spacing-xxs) 0;
      border: 2px solid transparent;
      border-radius: var(--gin-border-xl);
      box-sizing: border-box;

      &:hover {
        color: var(--gin-color-primary);
        background: var(--gin-color-primary-light-hover);
      }
    }

    input {
      opacity: 0;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: 0;
      border: 0;

      &:focus + .form-item__label {
        box-shadow: 0 0 0 1px var(--gin-color-focus-border),
                    0 0 0 4px var(--gin-color-focus);
      }

      &:checked + .form-item__label {
        font-weight: var(--gin-font-weight-bold);
        color: var(--gin-color-primary-active);
        background: var(--gin-color-primary-light-active);
      }
    }
  }
}

// Settings with images.
[data-drupal-selector="edit-classic-toolbar"],
[data-drupal-selector="edit-layout-density"] {
  .form-radios {
    display: flex;
    flex-wrap: wrap;
    margin-top: var(--gin-spacing-xs);

    .form-item {
      position: relative;
      display: flex;
      flex-wrap: wrap;
      width: 140px;
      margin: 0 var(--gin-spacing-s) 0 0;

      input {
        cursor: pointer;
        position: static;
        width: 140px;
        height: 100px;
        margin-left: 0;
        border-radius: var(--gin-border-l);
        transform: none;

        &
        &:focus {
          border-color: var(--gin-color-text);
          box-shadow: none;
        }

        &:checked {
          border-color: var(--gin-color-primary);
          box-shadow: inset 0 0 0 1px var(--gin-color-primary);
        }

        &:focus {
          box-shadow: 0 0 0 3px var(--gin-color-focus);
        }

        &:checked:focus {
          box-shadow: inset 0 0 0 1px var(--gin-color-primary),
                      0 0 0 3px var(--gin-color-focus);
        }

        background-repeat: no-repeat;
        background-size: 100% 100%;
      }

      .form-item__label {
        font-size: var(--gin-font-size-xxs);
        display: block;
        margin-top: var(--gin-spacing-xs);
        margin-bottom: var(--gin-spacing-m);
      }
    }
  }
}

// Settings: Toolbar selector.
[data-drupal-selector="edit-classic-toolbar"] {
  .form-radios .form-item input {
    // Standard: Sidebar
    &[data-gin-toolbar=vertical] {
      background-image: url(~settings/toolbar_sidebar.png);

      .gin--dark-mode & {
        background-image: url(~settings/toolbar_sidebar_darkmode.png);
      }
    }

    // Minimal
    &[data-gin-toolbar=horizontal] {
      background-image: url(~settings/toolbar_minimal.png);

      .gin--dark-mode & {
        background-image: url(~settings/toolbar_minimal_darkmode.png);
      }
    }

    // Classic/Legacy
    &[data-gin-toolbar=classic] {
      background-image: url(~settings/toolbar_legacy.png);

      .gin--dark-mode & {
        background-image: url(~settings/toolbar_legacy_darkmode.png);
      }
    }
  }
}

// Settings: Layout density.
[data-drupal-selector="edit-layout-density"] {
  .form-radios .form-item input {
    // Default
    &[data-drupal-selector=edit-layout-density-default] {
      background-image: url(~settings/layout_density_default.png);

      .gin--dark-mode & {
        background-image: url(~settings/layout_density_default_darkmode.png);
      }
    }

    // Medium
    &[data-drupal-selector=edit-layout-density-medium] {
      background-image: url(~settings/layout_density_medium.png);

      .gin--dark-mode & {
        background-image: url(~settings/layout_density_default_darkmode.png);
      }
    }

    // Small
    &[data-drupal-selector=edit-layout-density-small] {
      background-image: url(~settings/layout_density_small.png);

      .gin--dark-mode & {
        background-image: url(~settings/layout_density_small_darkmode.png);
      }
    }
  }
}