gnome-shell/data/theme/gnome-shell-sass/_common.scss

//This is the RIGHT PLACE to edit the stylesheet

//let's start by telling people not to edit the generated CSS:
$cakeisalie: "This stylesheet is generated, DO NOT EDIT";
/* #{$cakeisalie} */

/* Copyright 2009, 2015 Red Hat, Inc.
 *
 * Portions adapted from Mx's data/style/default.css
 *   Copyright 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU Lesser General Public License,
 * version 2.1, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

/* Global Values */

// padding, margin and spacing
$base_padding: 6px;
$base_margin: 4px;
$base_spacing: 6px;

// border radii
$base_border_radius: 8px;

// radii of things that display over other things, e.g. popovers
$modal_radius: $base_border_radius*2; // 24px

// non-standard colors
$bubble_borders_color: lighten($borders_color, if($variant=='light', 0%, 5%));
$bubble_buttons_color: if($variant == 'light', darken($bg_color, 12%), lighten($bg_color, 4%));
// $bubble_borders_color: if($variant == 'light', rgba(255,255,255,0.1), rgba(0,0,0,0.3));

// derived hover colors
$hover_bg_color: if($variant=='light', darken($bg_color, 3%), lighten($bg_color, 7%));
$hover_fg_color: if($variant=='light', darken($fg_color, 5%), lighten($fg_color, 7%));

// derived active colors
$active_bg_color: darken($bubble_buttons_color,if($variant=='light', 9%, 2%));
$active_fg_color: darken($fg_color,if($variant=='light', 5%, 3%));

// fonts
$base_font_size: 11;
$text_shadow_color: if($variant == 'light', rgba(255,255,255,0.3), rgba(0,0,0,0.2));

// icons
$base_icon_size: 1.09em;
// $base_icon_size: 16px;

// Stage
stage {
  @include fontsize($base_font_size);
  color: $fg_color;
}

/* Common Stylings */

// Text
%status_text {
  font-size: 2em;
  font-weight: bold;
  color: $osd_fg_color;
}

// osd panels
%osd_panel {
  color: $osd_fg_color;
  background-color: $osd_bg_color;
  border: 1px solid $osd_outer_borders_color;
  border-radius: $modal_radius;
  padding: $base_padding*2;
}

// Overview panels
// for the dash and workspace switcher
%overview_panel {
  color: $osd_fg_color;
  background-color: transparentize($osd_fg_color, 0.9);
}

// icon tiles
%icon_tile {
  border-radius: $base_border_radius * 2; // 16px
  padding: $base_padding;
  border: 2px solid transparent;
  transition-duration: 100ms;
  text-align: center;
}

// button styling
%button {
  border-radius: $base_border_radius - 2px; // 6px
  border-style: solid;
  border-width: 1px;
  min-height: 22px;
  padding: $base_padding * 0.5 $base_padding * 4;

  @include button(normal);
  &:focus { @include button(focus);}
  &:hover { @include button(hover);}
  &:insensitive { @include button(insensitive);}
  &:active, &:checked { @include button(active);}
}

// dialogs
%bubble_panel {
  color: $fg_color;
  background-color: $bg_color;
  border-radius: $base_border_radius*1.25 + 1px;
  border: 1px solid $borders_edge;
}

// buttons in dialogs/notifications
// styled to have no shadow and be lighter in color
$bubble_button_radius:$base_border_radius*1.25;

%bubble_button {
  padding: $base_padding * 2;
  border: 0 solid $bg_color !important; 
  border-radius: 0;
  border-right-width: 1px !important; 

  @include button(normal, $bubble_buttons_color, $shadow: none);
  &:insensitive { @include button(insensitive, $shadow: none); }
  &:focus { @include button(focus, $shadow: none); }
  &:hover { @include button(hover, $bubble_buttons_color, $shadow: none); }
  &:active { @include button(active, $bubble_buttons_color, $shadow: none); }
  
  &:first-child {
    border-radius: 0 0 0 $bubble_button_radius; 
  }

  &:last-child {
    border-radius: 0 0 $bubble_button_radius 0;
    border-right-width: 0 !important;
  }
}

// styling for elements within popovers that look like notifications
@mixin notification_bubble($flat: false) {
  border-width: 0px;
  border-style: solid;
  border-radius: $base_border_radius;
  margin: $base_margin;

  @if $flat {
    @include button(undecorated);
  } @else {
    @include button(normal);
  }

  &:focus {
    @include button(focus);
  }

  &:hover {
    @include button(hover);
  }

  &:active {
    @include button(active);
  }
}