Changed The Background color in choose your platform section

[shailpujan88]

Description

This PR fixes #1735

Notes for Reviewers Changed the background color of the Choose Your Platform section.

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[shailpujan88]

@leecalcote I have made the required changes. Can you please verify them?

[ritiksaxena124]

Don't use hardcoded values for styling. Try to use variables and avoid using inline styling @shailpujan88.