Board Thread:Support Requests - Getting Technical/@comment-93604-20130314191642/@comment-452-20130314202509

The CSS selector you are looking for is ".mw-collapsible-toggle a"

There's already a single nbsp before and after the square brackets.

As it says on Help:Collapsing, you can use "data-expandtext" to change the text within the square brackets, but there's no parameters to change the square brackets themselves.

edit: Wait, why do you want to add a nbsp anyway?

.mw-collapsible-toggle { margin-left: 1em; } will add the same space as 1 nbsp.