server/core/css/variables.scss

// SCSS darken/lighten function override
@function nc-darken($color, $value) {
	@return darken($color, $value);
}

@function nc-lighten($color, $value) {
	@return lighten($color, $value);
}

// SCSS variables
// DEPRECATED, please use CSS4 vars
$color-main-text: #000 !default;
$color-main-background: #fff !default;

// used for different active/disabled states
$color-background-dark: nc-darken($color-main-background, 7%) !default;
$color-background-darker: nc-darken($color-main-background, 14%) !default;

$color-primary: #0082c9;
$color-primary-text: #ffffff;
// do not use nc-darken/lighten in case of overriding because
// primary-text is independent of color-main-text
$color-primary-text-dark: darken($color-primary-text, 7%) !default;
$color-primary-element: $color-primary !default;
$color-primary-element-light: lighten($color-primary-element, 15%) !default;

$color-error: #e9322d;
$color-warning: #eca700;
$color-success: #46ba61;

// rgb(118, 118, 118) / #767676
// min. color contrast for normal text on white background according to WCAG AA
// (Works as well: color: #000; opacity: 0.57;)
$color-text-maxcontrast: nc-lighten($color-main-text, 46.2%) !default;
$color-text-light: nc-lighten($color-main-text, 15%) !default;
$color-text-lighter: nc-lighten($color-main-text, 30%) !default;

$image-logo: url('../img/logo.svg?v=1');
$image-login-background: url('../img/background.png?v=2');

$color-loading-light: #ccc !default;
$color-loading-dark: #777 !default;

$color-box-shadow: rgba(nc-darken($color-main-background, 70%), 0.75) !default;

// light border like file table or app-content list
$color-border: nc-darken($color-main-background, 7%) !default;
// darker border like inputs or very visible elements
$color-border-dark: nc-darken($color-main-background, 14%) !default;
$border-radius: 3px !default;

$font-face: 'Open Sans', Frutiger, Calibri, 'Myriad Pro', Myriad, sans-serif !default;