In Webkit browsers (Chrome and Safari), there are several unsightly borders around buttons throughout the Theme Customizer.
- “Close” button at the top: (screenshot: http://cl.ly/LMUv)
- “Upload New” tab in Header Image and Background Image panels: (screenshot: http://cl.ly/LM8i)
- “Customize” text link in Manage Themes panel: (screenshot: http://cl.ly/LMWN)
Just little niggles, but nothing some CSS (focus: outline: none;) couldn't easily fix.