About three weeks ago, I (in Archlinux) updated Gnome to version 3.4 and in Opera it became strange to look like “non-stylized” elements in forms. The reason was the updated Adwaita (default theme). Developers, it seems, promised to correct this incident in the next version of Opera, but recently the browser has been updated to version 11.64, and the forms are still displayed.
The problem (if for someone it is really a problem) is solved by simply changing the “Dialog Toolkit” parameter in the browser settings. Those. open opera: config, copy-paste the string "Dialog Toolkit" in the search, set the value to one or two, to use the dialogs from qt or gtk, respectively, and the display of form elements will also be corrected.
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Result:
PS The decision spied on the forum