Used properties maxheight and overflow to hide scrollbar when navbar is opened.

[Prikshit-anthal]

…opened

Issue reference: #54

Proposed changes:Stopped scroll bar to move when navbar is opened in small width devices

Type of change:Bug fix

Please delete options that are not relevant.

• [X] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings

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[varunKT001]

@Prikshit-anthal I'll be reviewing both of your pull requests soon. I've some important tasks to complete 😅