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

/* App Grid */

$app_icon_size: 96px;
$app_icon_padding: 24px;

// app icons
.icon-grid {
  -shell-grid-horizontal-item-size: $app_icon_size + $app_icon_padding * 2;
  -shell-grid-vertical-item-size: $app_icon_size + $app_icon_padding * 2;
  spacing: $base_spacing * 6;

  .overview-icon {
    icon-size: $app_icon_size;
    StIcon { margin-bottom: $base_margin; } // margin on icon so label isn't close
  }
}

//.app-display { spacing: 20px; }

/* App Icons */

$app_grid_fg_color: #fff;

// Outline for low res icons
.lowres-icon {
  icon-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

// Dropshadow for large icons
.icon-dropshadow {
  icon-shadow: 0 1px 2px rgba(0,0,0,0.4);
}

// Icon tiles in the app grid
.app-well-app,
.app-folder {

  .overview-icon {
    @extend %icon_tile;
    color: $app_grid_fg_color !important;
  }

  &:selected {
    .overview-icon {
      background-color: transparentize($osd_bg_color,0.7);
      color: $app_grid_fg_color;
    }
  }

  &:hover,
  &:focus,
  &:selected {
    .overview-icon {
      background-color: transparentize($osd_fg_color,0.9);
      color: $osd_fg_color;
    }
  }

  &:focus {
    .overview-icon {
      background-color: transparentize($osd_fg_color,0.7  );
      // border-color: $selected_bg_color;
      color: $app_grid_fg_color;
    }
  }

  &:drop {
    .overview-icon {
      background-color: transparentize($selected_bg_color,.15);
    }
  }

  &:active,
  &:checked {
    .overview-icon {
      background-color: transparentize(darken($osd_bg_color,10%), 0.5);
    }
  }
}

/* App Folders */
.app-folder {
  .overview-icon {
    @extend %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 }

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

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

      & > StIcon { icon-size: 16px }
    }
  }

  & StButton#vhandle,
  & StButton#vhandle:hover,
  & StButton#vhandle:active { background-color: transparent; }
}
.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,
.frequent-apps > StBoxLayout {
  // horizontal padding to make sure scrollbars or dash don't overlap content
  padding: 0px 88px 10px 88px;
}

.app-well-app > .overview-icon.overview-icon-with-label {
  padding: 10px 8px 5px 8px;
  spacing: $base_spacing;
}

// Label when no frequent apps
.no-frequent-applications-label { @extend %status_text; }

// 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;
}

/* Frequent | All toggle */

// container
.app-view-controls { 
  padding-bottom: 32px;
}

// buttons
.app-view-control {

  padding: 4px 32px;
  margin: 0 4px;
  &, &:hover, &:checked {
    @include button(undecorated);
    color: darken($osd_fg_color, 25%);
    background-color: transparent !important;
  }

  &:hover {
    color: $osd_fg_color;
    box-shadow: inset 0 -2px darken($osd_fg_color, 25%);
  }

  &:active {
    box-shadow: inset 0 -2px $osd_fg_color;
  }

  &:checked {
    color: $osd_fg_color;
    box-shadow: inset 0 -2px $selected_bg_color;
  }

  &:first-child {
    border-right-width: 0;
    border-radius: 0;
  }

  &:last-child {
   border-radius: 0;
  }
}