If you use a black website background, store font and navigation colours might not be visible. To correct that:
1. Go to your Ecwid account and click on "design" in the left panel
2. Scroll to the bottom on the page and then click on "Create Theme".
3. Click "New-CSS Design" and name it ex. Dark Theme.
4. Paste this code:
.ec-store * {
color: #fff !important;
}
5. Click "Activate" and "Save" - Done!
*make sure that the color adaptation is enabled.