gnome-shell/data/theme/gnome-shell-sass/widgets/_app-grid.scss

/* App Grid */

$app_icon_size: 96px;

// app icons
.icon-grid {
  row-spacing: $base_spacing * 6;
  column-spacing: $base_spacing * 6;
  max-row-spacing: $base_spacing * 12;
  max-column-spacing: $base_spacing * 12;
}

/* App Icons */

$app_grid_fg_color: #fff;

// Icon tiles in the app grid
.app-well-app,
%app-well-app {
  @include overview-icon($app_grid_fg_color);

  .overview-icon.overview-icon-with-label {
    padding: 10px 8px 5px 8px;

    > StBoxLayout {
      spacing: $base_spacing;
    }
  }
}

/* App Folders */
.app-well-app.app-folder {
  background-color: transparentize($osd_bg_color, 0.8);
  border-radius: $base_border_radius + 4px; // same as %icon_tile
}

// expanded folder
.app-folder-dialog {
  border-radius: $modal_radius * 1.5;
  border: 1px solid $osd_outer_borders_color;
  spacing: 12px;
  background-color: transparentize(darken($osd_bg_color,10%), 0.05);

  & .folder-name-container {
    padding: 24px 36px 0;
    spacing: 12px;

    & .folder-name-label,
    & .folder-name-entry {
      font-size: 18pt;
      font-weight: bold;
    }

    & .folder-name-entry { width: 300px }

    /* FIXME: this is to keep the label in sync with the entry */
    & .folder-name-label { padding: 5px 7px; color: $osd_fg_color; }

    & .edit-folder-button {
      @extend %button;

      padding: 0;
      width: 36px;
      height: 36px;
      border-radius: 18px;

      & > StIcon { icon-size: 16px }
    }
  }
}
.app-folder-dialog-container {
  padding: 12px;
  width: 800px;
  height: 600px;
}

.app-folder-icon {
  padding: $base_padding;
  spacing-rows: $base_spacing;
  spacing-columns: $base_spacing;
}


// Running app indicator (also shown in dash)
.app-well-app-running-dot {
  height: 5px;
  width: 5px;
  border-radius:5px;
  background-color: $osd_fg_color;
  margin-bottom: 1px;
}

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

// right-click app menu
.app-menu,
.app-well-menu {
  max-width: 27.25em;
}

// App Grid pagination indicators
.page-indicator {
  padding: 15px 20px;

  .page-indicator-icon {
    width: 10px;
    height: 10px;
    border-radius: 10px; // the same as height&width
    background-color: white;
  }
}

// Some hacks I don't even know
.all-apps {
  // horizontal padding to make sure scrollbars or dash don't overlap content
  padding: 0px 88px 10px 88px;
}

// shutdown and other actions in the grid
.system-action-icon {
  background-color: rgba(0,0,0,0.8);
  color: #fff;
  border-radius: 99px;
  icon-size: $app_icon_size * 0.5;
}