Revamp Broken Landing Page

My landing page is in disarray and requires immediate attention. The HTML structure, JavaScript functionality, and CSS styling are all broken and need to be cleaned up. Should be an easy fix for someone experienced.

Key tasks include:
- Diagnosing and fixing issues with the HTML
- Restoring JavaScript functionality
- Correcting CSS styling

I don't have a new design or layout in mind; the task is simply to fix the current structure. The page should work on all modern browsers, so please ensure cross-browser compatibility.

Ideal skills and experience for the job include:
- Proficiency in HTML, JavaScript, and CSS
- Experience with troubleshooting and debugging code
- Knowledge of cross-browser compatibility issues
- Attention to detail and ability to follow existing design structures.