In D14067#392122, @ashoat wrote:

The design here doesn't look great to me... it feels like we're taking the "design language" of LoggedOutModal and applying it in a place where we're mostly using the RegistrationNavigator "design language".

Can we instead try to base the design on RegistrationNavigator? I think we can keep the general structure here (one username field, one password field, and a button), but instead:

1. Look at UsernameSelection to get an idea of how to style the username input field.
2. Look at PasswordSelection to get an idea of how to style the password input field.
3. Use PrimaryButton for the sign-in button.

If we do this, then after launching signed device lists we can probably totally deprecate LogInPanel. What do you think?