The bottom addressbar can be cleared by using the env() setting. You can add more padding to the bottom to make sure everything clears the addressbar.
padding:
env(safe-area-inset-top, 20px)
env(safe-area-inset-right, 20px)
env(safe-area-inset-bottom, 20px)
env(safe-area-inset-left, 20px)
;
The behavior isn't very consistent from what i've seen but this should help you out.
Joosd
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