Hello Ito,
Hope you are doing great!
Follow the below steps to add custom CSS.
1) Please log in to the admin area
2) Go to “Appearance >> Customize >> Additional CSS”.
3) Paste the below code in “Additional CSS”
#home-page-widget-area .bg_enabled .widget-title span::before, #home-page-widget-area .bg_enabled .widget-title span::after, #home-page-widget-area .winsome_widget_services .widget-title span::before, #home-page-widget-area .winsome_widget_services .widget-title span::after, #home-page-widget-area .winsome_widget_latest_news .widget-title span::before, #home-page-widget-area .winsome_widget_latest_news .widget-title span::after, #home-page-widget-area .winsome_widget_about_us .widget-title span::before, #home-page-widget-area .winsome_widget_about_us .widget-title span::after, #home-page-widget-area .pt_theme_addon_widget_our_team .widget-title span::before, #home-page-widget-area .pt_theme_addon_widget_our_team .widget-title span::after, #home-page-widget-area .pt_theme_addon_widget_portfolio .widget-title span::before, #home-page-widget-area .pt_theme_addon_widget_portfolio .widget-title span::after{
background-color:#COLORCODE;
}
4) Save the File
Hope this helps.
Feel free to get in touch in case of other queries.
Thanks and Regards,
Team ProDesigns