Region select option is very small on narrow screens

Sorry folks, realised this isn't actually a duplicate. Best to look at 🐛 Select form field values are hidden at narrow screen widths in Claro theme Fixed for the approach though, we definitely should not just hide this element on smaller screens!

Also just moving to the Seven contrib queue since it's no longer in core.

I am working on it.

I have done the changes as mention in #23. Please review the changes.

Before:

After: