How to change widget BG colors for dark theme?

[sleeponmic]

I want to have my website dark themed. I have changed the text to white but how do I change the block/widget BG colors? I also need the other information to be white if I can manage to get a black BG.

Sample images:

[ihor]

This would probably require many CSS tweaks, to target all the boxes and switch the background along with inverting the colors of all the elements. If you’re familiar with CSS please try starting with this snippet:

.listing--view-block {background-color:#000}