Added my customized button css

[divya-nshi]

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Description

Added a rainbow colour button on hover

Class Naming Convention for your button

• Does your html button element have class-name like this: your_github_username-button-index (example: rajkumar-justcoder-button-1 ).

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Related Issues

Fixes Issue #91

Screenshot

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[Rajkumar-justcoder]

This button is copy of user cypher1002 and just modified colors and animition speed so its invalid and closing this