Installation: WordPress 5.1.1
PHP: 7.3
Theme version: latest
Going to customize the theme produces warnings due to content before HTML header due to schema color selectors:
Warning: Cannot modify header information – headers already sent by (output started at /shop.tech/wp-content/themes/real/functions/theme/customize/customize-options.php:35) in /shop.tech/wp-admin/includes/misc.php on line 1198
Output:
<div id=”customize_scheme-scheme-1″>
<input type=”hidden” name=”theme_main_color” value=”#DFBD83″ />
<input type=”hidden” name=”second_auxiliary_color” value=”#EEEEEE” />
<input type=”hidden” name=”logo_text_color” value=”#FFFFFF” />
<input type=”hidden” name=”logo_text_color_footer” value=”#E0E0E0″ />
<input type=”hidden” name=”menu_item_text_color” value=”#EBEBEB” />
<input type=”hidden” name=”menu_activated_item_text_color” value=”#DFBD83″ />
<input type=”hidden” name=”submenu_text_color” value=”#EBEBEB” />
<input type=”hidden” name=”heading_color” value=”#28282E” />
<input type=”hidden” name=”content_text_color” value=”#313139″ />
<input type=”hidden” name=”auxiliary_content_color” value=”#999999″ />
<input type=”hidden” name=”selected_text_bg_color” value=”#DFBD83″ />
<input type=”hidden” name=”page_post_bg_color” value=”#FFFFFF” />
<input type=”hidden” name=”page_post_cover_bg_color” value=”#313139″ />
<input type=”hidden” name=”page_post_cover_mask_color” value=”#28282E” />
<input type=”hidden” name=”sidebar_widget_title_color” value=”#28282E” />
<input type=”hidden” name=”sidebar_content_color” value=”#999999″ />
<input type=”hidden” name=”hidden_sidebar_widget_title_color” value=”#FFFFFF” />
<input type=”hidden” name=”hidden_sidebar_widget_content_color” value=”#CCCCCC” />
<input type=”hidden” name=”hidden_sidebar_bg_color” value=”#313139″ />
<input type=”hidden” name=”footer_text_color” value=”#FFFFFF” />
<input type=”hidden” name=”footer_bg_color” value=”#313139″ />
</div>
.
WordPress Customization Service from 
