A CSS selector to get last visible div

Try

div:not([style*="display: none"]):last-child

You could select and style this with JavaScript or jQuery, but CSS alone can't do this.

For example, if you have jQuery implemented on the site, you could just do:

var last_visible_element = $('div:visible:last');

Although hopefully you'll have a class/ID wrapped around the divs you're selecting, in which case your code would look like:

var last_visible_element = $('#some-wrapper div:visible:last');

The real answer to this question is, you can't do it. Alternatives to CSS-only answers are not correct answers to this question, but if JS solutions are acceptable to you, then you should pick one of the JS or jQuery answers here. However, as I said above, the true, correct answer is that you cannot do this in CSS reliably unless you're willing to accept the :not operator with the [style*=display:none] and other such negated selectors, which only works on inline styles, and is an overall poor solution.