Used following for minifying CSS:

https://csscompressor.com/

bootstrap.min.css (used direct)

jquery.smartmenus.bootstrap.min.css
	minified from jquery.smartmenus.bootstrap.css
	using first most compact, least readable option

jquery.cookiebar.min.css
	minified from jquery.smartmenus.bootstrap.css
	using first most compact, least readable option

styles.min.css
	minified from styles.css
	using second option with reasonable readability in case I want to change directly
	reduced from 9447 to 5589 bytes (most compression is 5505)

custom.min.css
	minified from custom.css
	using second option with reasonable readability in case I want to change directly
	reduced from 9394 to 5754 bytes (most compression is 5665)