I usually edit the content by using Evernote application on Mac. When I need to set foreground/background colours, I switch to Google Chrome, and use the "Add-ons for Evernote Web App" extension. It is the perfect solution.
https://chrome.google.com/webstore/detail/add-ons-for-evernote-web/bnflfnhcfikgmmcmoghhejelmefpjhek?hl=en-US
This is what you see in Chrome