Call and after-call screen doesn't size to mobile screens

[holmesworcester]

The first screen of the widget resizes nicely, but on the second it hangs off the screen.

Buttons (e.g. "send video") should either wrap or be hidden if they don't fit on the screen. Call button and phone number field should resize.

[holmesworcester]

You can see this in dev tools and on a Nexus 6 in Chrome.