The CSS Editor in Squarespace allows you to apply custom styling beyond default options through custom CSS code. This feature is ideal for developers who want to modify fonts, colors, and backgrounds.

Key Features:

• Custom styling for fonts, colors, and backgrounds
• Syntax checking system for browser compatibility
• Line numbering for easy reference
• Real-time error detection

Adding CSS Code:

1. Navigate to "Custom CSS" menu
2. Click "Open in New Window"
3. Add your CSS code
4. Click "Save" to publish changes

Custom File Management:

1. Access "Custom Files" under CSS Editor
2. Click "Add Images or Fonts" or drag files
3. Supported formats: .jpg, .png, .gif, .ttf, .otf, .woff
4. System automatically generates file URLs for code insertion

SSL Compatibility: When SSL is enabled:

1. Open CSS Editor
2. Click "Manage Custom Files"
3. Select file
4. Update URL to use https
5. Save changes

Important Notes:

• CSS changes don't transfer between templates in version 7.0
• Limit CSS modifications to styling elements only
• Custom code should follow best practices
• Syntax errors appear in red at the bottom
• Regular validation ensures proper functionality

Resource Options:

• Squarespace Forum for community support
• Professional Squarespace experts available
• Premium and enterprise solutions for advanced needs

Remember to thoroughly test all CSS changes before implementation to ensure website stability and proper functionality across all browsers.

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