Change the background image

Hi @sounds,

Please navigate to Dashboard > Comments > Settings > Styling admin page, put the following CSS code in “Custom CSS Code” textarea, save it, delete all caches and check again.

Don’t forget to change boldly marked code before using:

#comments {
    background: <strong>url(dark.png) #222222</strong>;
}

@sounds,

yes, that should work fine.

@sounds,

Please delete all caches of WP Super Cache plugin and press CTRL+F5(twice) on the frontend.

Article on How to Clear the Cache of WP Super Cache plugin here:
https://wpshout.com/quick-guides/delete-cache-wp-super-cache/