Update CSS for `hr` elements to halve the top and bottom margin from 48px to 24px in `static/css/styles.css`. Replit-Commit-Author: Agent Replit-Commit-Session-Id: 75bceff7-98f2-4f6e-ae8e-e735399a1fe8 Replit-Commit-Checkpoint-Type: full_checkpoint Replit-Commit-Event-Id: e1ff805b-39a9-4e33-97f8-c97fa7ad62f5 Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/d0a1d46d-d203-4308-bc6a-312ac7c0243b/75bceff7-98f2-4f6e-ae8e-e735399a1fe8/z0JFAvo