In 2020, custom CSS provided by e-shop designer may be referencing images that will be removed because the service is no longer available. Please stop using any custom CSS from e-shop designer to avoid any problems with your storefront.
To stop using a custom CSS, follow these steps:
1. In the Ecwid Control panel, click on Design, then Create Theme
2. select the "Standard" theme or another custom theme that is not from e-shop designer. Remember to activate the new theme, then save the settings.