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Welcome to the freeCodeCamp-Code wiki!
Lesson 1: Say Hello to HTML Elements
Lesson 2: Headline with the h2 Element
Lesson 3: Inform with the Paragraph Element
Lesson 4: Uncomment HTML
Lesson 5: Comment out HTML
Lesson 6: Fill in the Blank with Placeholder Text
Lesson 7: Delete HTML Elements
Lesson 8: Change the Color of Text
Lesson 9: Use CSS Selectors to Style Elements
Lesson 10: Use a CSS Class to Style an Element
Lesson 11: Style Multiple Elements with a CSS Class
Lesson 12: Change the Font Size of an Element
Lesson 13: Set the Font Family of an Element
Lesson 14: Import a Google Font
Lesson 15: Specify How Fonts Should Degrade
Lesson 16: Add Images to your Website
Lesson 17: Size your Images
Lesson 18: Add Borders Around your Elements
Lesson 19: Add Rounded Corners with a Border Radius
Lesson 20: Make Circular Images with a Border Radius
Lesson 21: Link to External Pages with Anchor Elements
Lesson 22: Nest an Anchor Element within a Paragraph
Lesson 23: Make Dead Links using the Hash Symbol
Lesson 24: Turn an Image into a Link
Lesson 25: Add Alt Text to an Image for Accessibility
Lesson 26: Create a Bulleted Unordered List
Lesson 27: Create an Ordered List
Lesson 28: Create a Text Field
Lesson 29: Add Placeholder Text to a Text Field
Lesson 30: Create a Form Element
Lesson 31: Add a Submit Button to a Form
Lesson 32: Use HTML5 to Require a Field
Lesson 33: Create a Set of Radio Buttons
Lesson 34: Create a Set of Checkboxes
Lesson 35: Check Radio Buttons and Checkboxes by Default
Lesson 36: Nest Many Elements within a Single Div Element
Lesson 37: Give a Background Color to a Div Element
Lesson 38: Set the ID of an Element
Lesson 39: Use an ID Attribute to Style an Element
Lesson 40: Adjusting the Padding of an Element
Lesson 41: Adjust the Margin of an Element
Lesson 42: Add a Negative Margin to an Element
Lesson 43: Add Different Padding to Each Side of an Element
Lesson 44: Add Different Margins to Each Side of an Element
Lesson 45: Use Clockwise Notation to Specify the Padding of an Element
Lesson 46: Use Clockwise Notation to Specify the Margin of an Element
Lesson 47: Style the HTML Body Element
Lesson 48: Inherit Styles from the Body Element
Lesson 49: Prioritize One Style Over Another
Lesson 50: Override Styles in Subsequent CSS
Lesson 51: Override Class Declarations by Styling ID Attributes
Lesson 52: Override Class Declarations with Inline Styles
Lesson 53: Override All Other Styles by using Important
Lesson 54: Use Hex Code for Specific Colors
Lesson 55: Use Hex Code to Color Elements White
Lesson 56: Use Hex Code to Color Elements Red
Lesson 57: Use Hex Code to Color Elements Green
Lesson 58: Use Hex Code to Color Elements Blue
Lesson 59: Use Hex Code to Mix Colors
Lesson 60: Use Hex Code to Color Elements Gray
Lesson 61: Use Hex Code for Specific Shades of Gray
Lesson 62: Use Abbreviated Hex Code
Lesson 63: Use RGB values to Color Elements
Lesson 64: Use RGB to Color Elements White
Lesson 65: Use RGB to Color Elements Red
Lesson 66: Use RGB to Color Elements Green
Lesson 67: Use RGB to Color Elements Blue
Lesson 68: Use RGB to Mix Colors
Lesson 69: Use RGB to Color Elements Gray