"Use case" pages contain dropdown menu bug

[wackerow]

Describe the bug

Dropdown menu for pages using the "use-cases", "staking" or "roadmap" templates/layouts ends up hidden under the hero section in some cases

To reproduce

1. Go to https://ethereum.org/en/defi on Desktop
2. Click on "Ethereum Use Cases" dropdown
3. Try to access the first option, noticing it's hidden and un-clickable under the hero section

Expected behavior

Menu should be on top and fully accessible when open

Screenshots

Desktop (please complete the following information)

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Smartphone (please complete the following information)

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Additional context

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Would you like to work on this issue?

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[theavitw]

Can I work on this @wackerow ?
Kindly assign it to me.

[pettinarip]

I think this issue is duplicated with #11304. @wackerow to confirm

[Another-DevX]

Cain i work on this issue, assign to me pls

[rahulpandey70]

@wackerow I think this is css issue, if you will down you will see dropdown perfectly

[snowden-fu]

Hi @wackerow , I have resolved the problem, I want to submit PR, how to make this assigned to me?