Margin-bottom Is Calculated Differently In Opera

I have a div with relative position and a children div with position absolute.

CSS: #co

Solution 1:

Seems like the Opera browser offered in the App Store is version 12, more than a year and a half outdated (actual is 25). Downloading it directly from their website and opening the jsfiddle doesnt show any conflict.

Solution 2:

Opera browser does not overrides the bottom property with margin-bottom... so it seems that margin bottom doubles by mistake in the browser.