Browser issue [Microsoft Edge] Border under the active tab

[refael]

A little styling issue

 

[Alien]

I can confirm this on RTM.

 

[Chris D]

There doesn't appear to be a reasonable fix for this. It's not quite exclusive to Edge, I can reproduce it on IE11 (on Windows 10 at least) and we think we've perhaps seen it on Android occasionally. It seems like it may be a sub-pixel level rendering issue.