Accessibility: Color and visibility of instance continue button for creating new account
For adding a new account in fedilab, at first the user is asked to input the instance/server.
The continue button is hidden behind the touch keyboard. The user must switch off the keyboard to see the button.
The color of this button suggest's that the input is wrong (in german "ausgegraut").
For better accessibility, the button should placed above the keyboard and change to a signal color after inputting a valid instance.
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