CSS styles your HTML.
  HTML should focus on structure, CSS on design.
  
  ## Link CSS file
  Create `styles.css` and link it in head:
  
  ```html
  <head>
    <link rel="stylesheet" href="styles.css" />
  </head>
  ```
  
  ## Example CSS (styles.css)
  ```css
  h1 { color: darkblue; }
  p { font-size: 18px; }
  ```
  
  ## Preview
  Your heading becomes dark blue, paragraph becomes bigger.
  
  ## Why separate file is better
  - easy to manage
  - same CSS can style multiple pages

Connect a CSS file to HTML and understand why CSS is separate from HTML.

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