fix: Added Dark Mode to Contact Form

[adi-exe]

Related Issue

Closes #157

Description

added dark mode in contact form ui and other minor ui bugs.

Screenshots (if applicable)

Original	Updated

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Checklist

• [ x] My code adheres to the established style guidelines of the project.
• [x ] I have included comments in areas that may be difficult to understand.
• [ x] My changes have not introduced any new warnings.
• [x ] I have conducted a self-review of my code.

[Kritika30032002]

In dark mode the size of form is less than size of phone img.

Make them equivalent like in light mode

[adi-exe]

@Kritika30032002 actually i forgot to mention it in the PR .
i have done it intentionally, as the UI looks better this way.

If you want me to make it same , do let me know .

[Kritika30032002]

https://nicepage.com/html-code/preview/simple-contact-us-form-2882096?device=desktop

design like this