html5 and css3 modal dialog don't work in Opera

[ThrashCardiom]

In this excellent and simple post, the author explain how to build a modal dialog only using html and ccs3.http://www.webdesignerdepot.com/2012/10/creating-a-modal-window-with-html5-and-css3/http://netdna.webdesignerdepot.com/uploads7/creating-a-modal-window-with-html5-and-css3/demo.htmlWork fine, except in Opera 12.12 (Opera/9.80 (X11; Linux x86_64) Presto/2.12.388 Version/12.12).In Opera, all clicks are disabled.What could be the issue?Thanks.