Astra_BB_Ultimate_Addon::default_type_button_font_size()

		public function default_type_button_font_size() {
			$font_size_arr       = array();
			$body_font_size      = astra_get_option( 'font-size-body' );
			$theme_btn_font_size = astra_get_option( 'font-size-button' );

			$font_size_arr['desktop'] = astra_responsive_font( $theme_btn_font_size, 'desktop' );
			$font_size_arr['tablet']  = astra_responsive_font( $theme_btn_font_size, 'tablet' );
			$font_size_arr['mobile']  = astra_responsive_font( $theme_btn_font_size, 'mobile' );

			if ( empty( $font_size_arr['desktop'] ) ) {
				$font_size_arr['desktop'] = astra_responsive_font( $body_font_size, 'desktop' );
			}
			if ( empty( $font_size_arr['tablet'] ) ) {
				$font_size_arr['tablet'] = astra_responsive_font( $body_font_size, 'tablet' );
			}
			if ( empty( $font_size_arr['mobile'] ) ) {
				$font_size_arr['mobile'] = astra_responsive_font( $body_font_size, 'mobile' );
			}

			return $font_size_arr;
		}