Autooptimize working fine but my default color for content vanished

Thanks to Autooptimize by blog’s speed and lighthouse grades have improved, just in an hour. But the color I had set for content area has disappeared. I’ve been using Astra Pro theme. Kindly help, as I have tried changing the color as well,but it doesnt work. Would appreciate if the suggested solution doesn’t involve coding.

The page I need help with: [log in to see the link]