Change color blue/dark

Hello i want lines and files for changing the color of the template because the dark and blue is like night mode.. i want something for more lignthing readable.
main.css lines 193 here i can change the background image or color and i want change all basic color to grey/white and some blue.

And i have issue i cant add comments in match ? its write “There are no comments at the moment!” i tryed everything still not working, its work only with blog comments.

Thanks.