Hello, I am trying to modify the default background color for odoo website module but i cant find the property i want to modify. In the Devtools console the property code i want to modify is: 

#wrapwrap > main {
background: #38383B;
}

Any ideas how i can change this code in the source code across all web pages?

I am using Self-hosted on Debian 12, Due to karma restrictions i can not post a photo..