cant change BG color in a block

I have a theme i purchased and working of that, all i would like to do is change BG color per page.

Side note i went into editor and under style sheet i do not see where i can edit it, just some stuff about the theme.

post your site address

The home page is pulling shortcode for the blocks, like i want to replace then BG color of the block under”our latest product”

https://carbonelectronics360.com/