public function get_default_scheme()
{
return [self::TYPOGRAPHY_1 => ['font_family' => 'Roboto', 'font_weight' => '600'], self::TYPOGRAPHY_2 => ['font_family' => 'Roboto Slab', 'font_weight' => '400'], self::TYPOGRAPHY_3 => ['font_family' => 'Roboto', 'font_weight' => '400'], self::TYPOGRAPHY_4 => ['font_family' => 'Roboto', 'font_weight' => '500']];
}