Visual Styling for Different Tile Values

[bhumishah2411]

Give tiles different colors based on their value.

Acceptance Criteria:

• Distinct colors for 2, 4, 8, 16, … 2048
• Text contrast readable
• Update via CSS classes

[kriSH-cD]

Hey @bhumishah2411 i like to make these changes, can you please assign it to me.