If your  site has dark background, you may face the problem with Ecwid texts and labels being unreadable. 

In order to fix this problem, perform these steps:

1. Log in to your Ecwid control panel and go to the System Settings → Design → CSS Themes page.

2. Find the "Red" theme, click its name to select it.

3. Press the Duplicate button to create a copy of the Red theme. Save it.

4. In this code replace "#450100" with the hex code of your site`s background color. (for example #000000 for black)

div.ecwid-categories,

div.ecwid-categories-MenuBarPopup,

div.ecwid-productBrowser,

div.ecwid-productBrowser-productsGrid-productTopFragment,

div.ecwid-productBrowser-productsGrid-productBottomFragment,

td.ecwid-productBrowser-cart-emptyCartPanel-td,

td.ecwid-Checkout-orderFailed-td,

div.ecwid-MessageBox, div.ecwid-MessageBox-msg,

div.ecwid-popup,

div.ecwid-DisappearingMessage {

    background-color: #450100;

}

Then add the modified code to the end of your copied theme. Save the changes.

5. Enable this theme and save the changes once again.  It will fix the problem.