Finally fixed >>7, it was bothering me for the few months I lazily considered opening that site.

Install this browser extension:
https://github.com/openstyles/stylus
https://addons.mozilla.org/en-US/firefox/addon/styl-us/

Create userstyle for bbspink.com

Copypaste this in it:

/* ==UserStyle==
@name           bbspink better style
@description    eh
@author         eh
==/UserStyle== */

#sidemenu {
	display: none;
}

.col-md-8 {
	width: auto;
}

body {
	background-image: none;
}