Style .message-popover

[danirabbit]

What Happened?

Password save is now a popover with style class .message-popover. It has some styles that aren't quite right like flat buttons with rounded border radii and a title label that's too small.

Steps to Reproduce

Enter a password into a website that triggers the "Save this password" behavior

Expected Behavior

Should match styles from Granite.MessageDialog as closely as we can

OS Version

7.x (Horus)

Software Version

Latest release (I have run all updates)

Log Output

No response

Hardware Info

No response

[danirabbit]

Filing in Ephy for now, but not sure if this is a pattern that's used elsewhere and we should just implement it in the main stylesheet