I am trying to change the background color of my Wordpress site, as well as the size of images I use on this site. However, I can't find the CSS file that specifies these properties for my Wordpress site.
If I can edit it, where is the CSS file that specifies these properties for my Wordpress site located?
You can edit CSS from admin panel also
here you can edit the files directly from this window and hit save when you’re done.

or
You can edit CSS file located at ,
Which theme do you use?
The most of wordpress themes have a style.css in their parent folder that finds in: wp-content/themes/your-theme.
If you can't find this file, you can add styles in custom CSS on the "Theme Options" in /wp-admin.
PD: I recommend you to use a child theme because if you need in the future to update the theme, all your modifications in it will lose.
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