Hi again,
Unfortunately I’m seeing the same error while getting in to your site. We’re a team working from different countries in different shifts so it’s best if you turn off the security until the issue is resolved.
In the mean time to change the color schemes, you can edit the page in Cornerstone and click on the elements to change the colors from it’s settings. For example, to change the card element icon color, click on the card element and change the icon color via element’s settings (see screenshot)
Some of them are the images, you can remove those and use your own images or remove the image and use an icon instead. For example:
If you still don’t see those options in Cornerstone, then to turn on the advanced options for all the elements go to X > Settings > User Preferences > Advanced Mode and select Always On (see screenshots)
Then you should see all the options to adjust the colors.
Hope this helps!