Add margin on top of cards for flash message gap

What does this MR do and why?

Shift the cards down to have gap between flash message. And hide the top navbar for the identity verification success page.

References

Screenshots or screen recordings

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Screenshot_2025-07-15_at_6.19.59_PM Screenshot_2025-07-17_at_3.28.38_PM
Screenshot_2025-07-17_at_3.45.27_PM Screenshot_2025-07-17_at_3.34.00_PM
Screenshot_2025-07-17_at_3.51.57_PM Screenshot_2025-07-15_at_3.11.01_PM

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Related to #538417

Edited by Roy Liu

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