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: 5px;

$modal_radius:$base_border_radius * 2;

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

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

// active
$active_bg_color: if($variant == 'light', darken($bg_color, 7%), darken($bg_color, 9%));
$active_fg_color: darken($fg_color,if($variant=='light', 5%, 3%));
$active_borders_color: darken($borders_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: $base_border_radius * 2 + 4px;
  padding: $base_padding * 2;
}

// Overview panels 
// for the dash and workspace switcher
%overview_panel {
  color: $osd_fg_color;
  background-color: transparentize($osd_bg_color, 0.2);
  border: 1px solid $osd_outer_borders_color;
}

// icon tiles
%icon_tile {
  background-color: transparent; // no background
  color: $osd_fg_color;
  border-radius: $base_border_radius + 4px;
  padding: $base_padding;
  border-width: 2px;
  border-style: solid;
  border-color: transparent;
  transition-duration: 100ms;
  text-align: center;
}

// dialogs
%bubble_panel {
  color: $fg_color;
  background-color: $bg_color;
  border: 1px solid if($variant=='light', rgba(0,0,0, 0.6), $borders_color);
}

// button styling
%button {
  border-radius: $base_border_radius;
  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 { @include button(active);}
}

// buttons in dialogs
%bubble_button {
  @include button(normal, $shadow: none);
  padding: $base_padding * 2;
  border-style: solid;
  border-width: 1px;
  border-left-width: 0;
  border-bottom-width: 0;

  &:insensitive { @include button(insensitive, $shadow: none); }
  &:hover { @include button(hover, $shadow: none); }
  &:focus { @include button(focus, $shadow: none); }
  &:active { @include button(active, $shadow: none); }

  // radius is 2 pixel less to fit in bubble
  &:first-child {
    border-radius: 0 0 0 $modal_radius - 2px;
  }

  &:last-child {
    border-right-width: 0;
    border-radius: 0 0 $modal_radius - 2px 0;
  }
  
  &:first-child:last-child {
    border-radius: 0 0 $modal_radius - 2px $modal_radius - 2px;
  }
}


// notification styling
@mixin notification_bubble($flat: false) {
  border-width: 1px;
  border-style: solid;
  border-radius: $base_border_radius + 2px;
  margin: $base_margin;

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

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

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

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