FEATURE:[GSSOC'23] Adding transition and hover to scroll to top button

[purviporwal1812]

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[Akanksha038]

Hello Sir/Ma'am, I would like to add transition and hover to scroll to top button. This will help to enhance the user experience. Please assign me this issue. I would like to work on this issue under GSSOC'23. Please let me fix this issue #191.