Colloid-gtk-theme/src/sass/gnome-shell/widgets-47-0/_app-grid.scss

/* App Icons */

$app_icon_size: 96px;
$app_folder_size: 720px;

// app icons
.icon-grid {
  row-spacing: 12px;
  column-spacing: 12px;
  max-row-spacing: 36px;
  max-column-spacing: 36px;
  page-padding-top: 24px;
  page-padding-bottom: 24px;
  page-padding-left: 18px;
  page-padding-right: 18px;
}

.overview-tile {
  color: on($osd, secondary);
  border-radius: $base_radius * 2.5;
  padding: 6px;
  border: none;
  transition-duration: 100ms;
  text-align: center;
  background-color: transparent;

  &:hover,
  &:focus,
  &:selected {
    color: on($osd);
    background-color: on($osd, divider);
    border-image: none;
    background-image: none;
  }

  &:active,
  &:checked, {
    color: on($osd);
    background-color: on($osd, track);
    box-shadow: none;
  }
}

// App Folders
.app-folder {
  background-color: on($osd, divider);
  border-radius: $base_radius * 2.5;
  color: on($osd, secondary);

  .overview-icon {
    background-color: transparent;
    border-radius: $base_radius * 2.5;
  }

  &:hover {
    background-color: overlay($osd, active);
    color: on($osd);
  }

  &:active {
    background-color: on($osd, track);
    color: on($osd);
  }
}

// Running app indicator (also shown in dash)
.app-grid-running-dot {
  width: $base_padding;
  height: 3px;
  border-radius: 2px;
  background-color: on($osd, track);
  margin-bottom: 0;

  StWidget.focused & {
    width: $base_padding * 4;
    background-color: $inverse-indicator !important;
  }
}

.app-folder-dialog-container {
  // pad the top with panel height so the folder doesn't overlap the panel on smaller resolutions
  padding-top: $item_size;
}

// expanded folder
.app-folder-dialog {
  width: $app_folder_size;
  height: $app_folder_size;
  border-radius: $menu_radius * 3;
  padding: $base_padding * 2;
  background-color: $osd;

  @if $rimless == 'false' {
    border: 1px solid black;
    box-shadow: inset 0 0 0 1px highlight($osd);
  } @else {
    border: none;
    box-shadow: none;
  }

  .folder-name-container {
    padding: $base_padding * 4 $base_padding * 6;
    padding-bottom: 0;

    .folder-name-label,
    .folder-name-entry {
      @extend %title_1;
    }

    .folder-name-entry {
      width: 12em;
      border: none;
      caret-color: on($osd);

      &:focus {
        background-color: on($osd, divider);
        color: on($osd);
      }
    }
  }

  .icon-button {
    background-color: overlay($osd);
    color: on($osd, secondary);
    border: none;
    padding: 0;
    width: 36px;
    height: 36px;
    border-radius: $circular_radius;

    > StIcon { icon-size: $base_icon_size; }

    &:hover { background-color: overlay($osd, hover); }
    &:checked, &:active { background-color: $inverse-indicator; color: on($inverse-indicator); }
  }

  .page-indicators {
    margin-bottom: 18px;
  }
}

// Rename popup for app folders
.rename-folder-popup {
  .rename-folder-popup-item {
    spacing: $base_padding;
    &:ltr, &:rtl { padding: 0 $base_padding * 2; }
  }
}

// shutdown and other actions in the grid
.system-action-icon {
  box-shadow: 0 4px 4px rgba(0, 0, 0, 0.2); // FIXME: this should really have a highlight
  background-color: $osd;
  color: on($osd);
  border-radius: $circular_radius;
  icon-size: $app_icon_size * 0.5;
}

// page navigation
.page-navigation-hint {
  &.dnd {
    background: rgba(255, 255, 255, 0.1);
  }

  &.next:ltr,
  &.previous:rtl {
    background-gradient-start: rgba(255, 255, 255, 0.05);
    background-gradient-end: transparent;
    background-gradient-direction: horizontal;
    border-radius: $modal_radius * 1.5 0px 0px $modal_radius * 1.5;
  }

  &.previous:ltr,
  &.next:rtl {
    background-gradient-start: transparent;
    background-gradient-end: rgba(255, 255, 255, 0.05);
    background-gradient-direction: horizontal;
    border-radius: 0px $modal_radius * 1.5 $modal_radius * 1.5 0px;
  }
}

.page-navigation-arrow {
  margin: $base_padding;
  padding: $base_padding * 3;
  width: $medium_icon_size;
  height: $medium_icon_size;
  border-radius: $circular_radius;
  transition-duration: 100ms;
  color: on($osd, secondary);
  background-color: transparent;

  > StIcon { color: on($osd); }

  &:insensitive {
    background-color: transparent;
    color: on($osd, disabled);
  }

  &:hover {
    background-color: on($osd, divider);
    color: on($osd);
  }

  &:active {
    background-color: on($osd, track);
    color: on($osd);
  }
}