Make the 'Join Our Community' button visible and functional on the homepage

Fixes a bug where the Community button was not displaying correctly by adding background.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 336e32c0-2b26-4f56-90d4-b67a75f1b63a
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/e7e58c8a-16cf-4e22-ac0b-1b6b7dd06a54/336e32c0-2b26-4f56-90d4-b67a75f1b63a/jw6SVOv
