Missing css variables in default theme

[akatov]

The default theme is missing definitions for the following css variables:

• --cl-border-src
• --cl-code-doc

[ccleberg]

I would suggest --cl-border-src: #DFDFD9; as it is one shade darker than the --cl-code-background variable.

However, I cannot find the .org-doc class anywhere in the source code or simpleblog output and can't tell what the --cl-code-doc variable is for. I searched the org-mode repo as well and couldn't find any mention of that export class.

I'd suggest removing --cl-code-doc variable unless there's a purpose for it.