Calculator position at the center.

[Rishav1707]

This PR closes the following issue:

closes #68

Changes made:

• Added position: absolute; property in a container class.
• Added top: 50%; property in a container class.
• Added bottom: 50%; property in a container class.

Screenshots:

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[Emilance]

Great Job @Rishav1707 👏👏, I appreciate your contribution