paper-gtk-theme/Paper/gtk-3.0/widgets/suggested-action-buttons.css

/* Copyright 2014 Sam Hewitt.
*
* This file is part of the Paper GTK theme.
*
* The Paper GTK theme is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* The Paper GTK theme is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the Paper GTK theme. If not, see http://www.gnu.org/licenses/.
*/

@define-color suggested_action_button shade(@header, 0.6);
@define-color suggested_action_button_foreground #fff;
@define-color backdrop_suggested_action_foreground alpha(#fff, 0.5);
@define-color insensitive_suggested_action_foreground alpha(#fff, 0.7);

/****************************
 * Suggested action buttons *
 ****************************/
 
.suggested-action.button {
    background-color: alpha(#000, 0.2);
    color: @suggested_action_button_foreground;
}

.suggested-action.button:hover {
    background-color: shade(@suggested_action_button, 1.2);
    color: @suggested_action_button_foreground;
}

.suggested-action.button:active,
.suggested-action.button:hover:active {
    background-color: shade(@suggested_action_button, 1.1);
    color: @suggested_action_button_foreground;
}

.suggested-action.button GtkLabel:backdrop,
.suggested-action.button:backdrop {
    background: none;
    color: @backdrop_suggested_action_foreground;
}

.suggested-action.button GtkLabel:insensitive,
.suggested-action.button:insensitive,
.suggested-action.button:active *:insensitive {
    background: none;
    color: @insensitive_suggested_action_foreground;
}

.suggested-action.button GtkLabel:backdrop:insensitive {
    color: @insensitive_foreground;
}

.suggested-action.button:insensitive:backdrop {
    background-color: alpha(@insensitive_background,0.7);
}