ngx-admin/src/app/@theme/styles/variables.scss

// @nebular theming framework
@import '~@nebular/theme/styles/theming';
// @nebular our of the box themes
@import '~@nebular/theme/styles/themes';

// TODO: rename into themes

// which themes you what to enable (empty to enable all - not recommended)
$nb-enabled-themes: (default, light, cosmic);

$nb-themes: nb-register-theme((
 // app wise variables for each theme
  sidebar-header-gap: 2rem,
  sidebar-header-height: initial,
  layout-content-width: 1400px,
), default, default);

$nb-themes: nb-register-theme((
  // app wise variables for each theme
  sidebar-header-gap: 2rem,
  sidebar-header-height: initial,
  layout-content-width: 1400px,
), cosmic, cosmic);

$nb-themes: nb-register-theme((
  // app wise variables for each theme
  sidebar-header-gap: 2rem,
  sidebar-header-height: initial,
  layout-content-width: 1400px,
), light, light);