bitwarden-desktop/src/scss/variables.scss

$font-family-sans-serif: 'Open Sans','Helvetica Neue',Helvetica,Arial,sans-serif;
$font-family-monospace: Menlo, Monaco, Consolas, "Courier New", monospace;
$font-size-base: 14px;
$font-size-large: 18px;
$font-size-small: 12px;
$text-color: #000000;
$border-color: #f0f0f0;
$border-color-dark: #ddd;
$list-item-hover: #fbfbfb;
$list-icon-color: #c7c7cd;
$border-radius: 3px;
$line-height-base: 1.42857143;

$gray: #555;
$gray-light: #777;
$text-muted: $gray-light;

$brand-primary: #3c8dbc;
$brand-danger: #dd4b39;
$brand-success: #00a65a;
$brand-info: #555555;
$brand-warning: #bf7e16;
$brand-primary-accent: #286090;

$background-color: white;
$background-color-alt: #f9fafc;
$background-color-alt2: #ecf0f5;

$box-background-color: $background-color;
$box-background-hover-color: $list-item-hover;
$box-border-color: $border-color;

$button-border-color: darken($border-color-dark, 12%);
$button-backgound-color: white;
$button-color: lighten($text-color, 40%);
$button-color-primary: darken($brand-primary, 8%);
$button-color-danger: darken($brand-danger, 10%);

$themes: (
    light: (
        textColor: $text-color,
        borderColor: $border-color,
        borderColorDark: $border-color-dark,
        backgroundColor: $background-color,
        backgroundColorAlt: $background-color-alt,
        backgroundColorAlt2: $background-color-alt2,
        boxBackgroundColor: $box-background-color,
        boxBackgroundHoverColor: $box-background-hover-color,
        boxBorderColor: $box-border-color,
    ),
    dark: (
        textColor: #ffffff,
        borderColor: #000000,
        borderColorDark: #000000,
        backgroundColor: #5f5f5f,
        backgroundColorAlt: #5f5f5f,
        backgroundColorAlt2: #5f5f5f,
        boxBackgroundColor: #5f5f5f,
        boxBackgroundHoverColor: #707070,
        boxBorderColor: #000000,
    ),
);

@mixin themify($themes: $themes) {
    @each $theme, $map in $themes {
        html.theme_#{$theme} & {
            $theme-map: () !global;
            @each $key, $submap in $map {
                $value: map-get(map-get($themes, $theme), '#{$key}');
                $theme-map: map-merge($theme-map, ($key: $value)) !global;
            }
            @content;
            $theme-map: null !global;
        }
    }
}

@function themed($key) {
    @return map-get($theme-map, $key);
}