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I have a problem with my current theme. When windows top border close to top panel, there's a transparent background at the top corner (please take a look at the attached image).

enter image description here

So, how could I :

  • remove it?
  • change the rounded corners (I love the less rounded corners - like MAC OS X)

Thanks in advance.

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To change the corners, you will have to edit the theme, or choose a different one. Also, you should ensure compositing is enabled, if you want rounded corners. You can do this by using compiz instead, or by running gconf-editor, opening the /apps/metacity/general item in the tree, and enabling the compositor_effects option in the list on the right. With that on, you should not see this artifact in the theme.

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