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HTML Improvements

1. Semantic Tags: Use more semantic tags for better structure and accessibility. For example, use <header>, <article>, and <footer> where appropriate.
2. Consistent Indentation: Ensure consistent indentation for better readability.

CSS Improvements

1. Responsive Design: Use relative units (like em, rem, %) instead of fixed units (like px) for better responsiveness.
2. Box-sizing: Add box-sizing: border-box; to ensure padding and borders are included in the element's total width and height.