nextcloud-server/core/css/variables.scss

$color-main-text: #000000;
$color-main-background: #ffffff;
$color-primary: #0082c9;
$color-primary-text: #ffffff;
$color-error: #e9322d;
$color-warning: #ffcc44;
$color-success: #46ba61;

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

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

$image-logo: '../img/logo-icon.svg?v=1';
$image-login-background: '../img/background.jpg?v=1';

$color-loading: #969696;
$color-loading-dark: #bbbbbb;
$color-box-shadow: rgba(nc-lighten($color-main-text, 20%), 0.75);