paper-gtk-theme/Paper/gtk-3.18/_colors.scss

// When color definition differs for dark and light variant
// it gets @if ed depending on $variant

// Main definitions
$base_color: if($variant == 'light', #ffffff, #455a64);
$bg_color: if($variant == 'light', #f7f7f7, #37474f);
$fg_color: if($variant == 'light', #444, #cfd8dc);
$text_color: if($variant == 'light', $fg_color, $fg_color);
$headerbar_bg_color: if($variant == 'light', #546e7a, darken($base_color, 10%));
$headerbar_fg_color: if($variant == 'light', #ffffff, transparentize(#ffffff, 0.2));

// Primary colors
$red: #d32f2f;
$orange: #ff9800;
$yellow: #f9ce1d;
$green: #4caf50;
$dark_blue: #3f51b5;
$blue: #2196f3;
$cyan: #26c6da;
$magenta: #f50057;
$purple: #673ab7;

$borders_color: if($variant == 'light', darken($bg_color,20%), darken($bg_color,10%));
$borders_edge: if($variant == 'light', transparentize(white, 0.8), transparentize(white, 0.9));
$selected_fg_color: #ffffff;
$selected_bg_color: if($variant == 'light', $blue, lighten($blue,10%));
$selected_borders_color: if($variant == 'light', darken($selected_bg_color, 10%), $borders_color);
$link_color: blue;
$link_visited_color:transparentize($link_color,0.5);
$top_highlight: if($variant == 'light', transparentize(white, 0.8), transparentize(white, 0.7));
$bottom_highlight: if($variant == 'light', transparentize(white, 0.7), transparentize(white, 0.9));
$dark_fill: mix($borders_color, $bg_color, 35%);
$menu_color: if($variant == 'light', $base_color, mix($bg_color, $base_color, 20%));
$popover_bg_color: $base_color;
$popover_hover_color: lighten($popover_bg_color, 5%);

$selection_mode_headerbar_bg_color: #347D9F;

$scrollbar_bg_color: transparent;
$scrollbar_slider_color: mix($fg_color, $bg_color, 60%);
$scrollbar_slider_hover_color: mix($fg_color, $bg_color, 80%);
$scrollbar_slider_active_color: if($variant=='light', darken($selected_bg_color, 10%), lighten($selected_bg_color, 10%));

$success_color: if($variant == 'light', $green, darken($green,10%));
$destructive_color: if($variant == 'light', $red, darken($red,10%));
$suggested_color: if($variant == 'light', $selected_bg_color, darken($selected_bg_color,10%));

$osd_fg_color: #cfd8dc;
$osd_text_color: white;
$osd_bg_color: transparentize(#202526, 0.2);
$osd_insensitive_bg_color: transparentize(mix($osd_fg_color, opacify($osd_bg_color, 1), 10%), 0.5);
$osd_insensitive_fg_color: mix($osd_fg_color, opacify($osd_bg_color, 1), 50%);
$osd_borders_color: transparentize(black, 0.3);

$sidebar_bg_color: mix($bg_color, $base_color, 50%);
$base_hover_color: transparentize($fg_color, 0.95);

$tooltip_borders_color: transparentize(white, 0.9);
$shadow_color: transparentize(black, 0.8);
$text_shadow_color: if($variant == 'dark', $shadow_color, transparentize(white, 0.9));
$icon_shadow_color: $text_shadow_color;

$drop_target_color: #4e9a06;

// Infobar colors
$warning_color: $yellow;
$error_color: $red;
$info_color: $blue;
$question_color: $green;

// Panel colors
$panel_bg_color: transparentize(black, 0.3);
$panel_fg_color: white;
$panel_borders_color: transparentize(black, 0.8);

// Insensitive state colors
$insensitive_fg_color: mix($fg_color, $bg_color, 50%);
$insensitive_bg_color: mix($bg_color, $base_color, 60%);
$insensitive_base_color: darken($base_color, 5%);
$insensitive_borders_color: $borders_color;

// Backdrop state colors
$backdrop_base_color: if($variant == 'light', darken($base_color, 1%), lighten($base_color, 1%));
$backdrop_text_color: mix($text_color, $backdrop_base_color, 80%);
$backdrop_bg_color: $bg_color;
$backdrop_headerbar_bg_color: darken($headerbar_bg_color, 5%);
$backdrop_headerbar_fg_color: if($variant == 'light', transparentize($headerbar_fg_color, 0.5), transparentize($headerbar_fg_color, 0.2));
$backdrop_fg_color: mix($fg_color, $backdrop_bg_color, 50%);
$backdrop_insensitive_color: if($variant == 'light', darken($backdrop_bg_color, 15%), lighten($backdrop_bg_color, 15%));
$backdrop_selected_bg_color: if($variant == 'light', lighten($selected_bg_color, 5%), lighten($selected_bg_color, 5%));
$backdrop_selected_fg_color: if($variant == 'light', transparentize($selected_fg_color, 0.5), transparentize($selected_fg_color, 0.5));
$backdrop_borders_color: mix($borders_color, $bg_color, 90%);
$backdrop_dark_fill: mix($backdrop_borders_color, $backdrop_bg_color, 35%);
$backdrop_sidebar_bg_color: mix($backdrop_bg_color, $backdrop_base_color, 50%);

$backdrop_scrollbar_bg_color: darken($backdrop_bg_color, 3%);
$backdrop_scrollbar_slider_color: mix($backdrop_fg_color, $backdrop_bg_color, 40%);

$backdrop_menu_color: if($variant == 'light', $backdrop_base_color, mix($backdrop_bg_color, $backdrop_base_color, 20%));