Opera is not without bugs. One of the most obtuse and irritating bugs of this browser is related to the correct handling of the CSS overflow property when applied to the iframe element. A typical example are the tweet buttons of Twitter. Let's see the details.
Though you can explicitly set overflow: hidden on both the target element and its nearest parent, Opera will always show a scrollbar, thus spoiling your layout:
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As far as I know, there's no clear and easy fix to this problem at the moment. The only relief is knowing that this browser shares about 2% of the browser market, so there's really nothing to worry about it.