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HTML5 and CSS

（已完成）Lesson:Say Hello to HTML Elements

（已完成）[Lesson: Headline with the h2 Element]（https://github.com/FreeCodeCampChina/freeCodeCamp-Code/wiki/HTML-&-CSS#%E6%A0%87%E9%A2%98%E4%B8%8E-h2%E5%85%83%E7%B4%A0 ）

（已完成）[Lesson: Inform with the Paragraph Element]（https://github.com/FreeCodeCampChina/freeCodeCamp-Code/wiki/HTML-&-CSS#inform-with-the-paragraph-element-%E9%80%9A%E7%9F%A5%E6%AE%B5%E8%90%BD%E5%85%83%E7%B4%A0）

Lesson: Uncomment HTML

Lesson: Comment out HTML

Lesson: Fill in the Blank with Placeholder Text

Lesson: Delete HTML Elements

Lesson: Change the Color of Text

Lesson: Use CSS Selectors to Style Elements

Lesson: Use a CSS Class to Style an Element

Lesson: Style Multiple Elements with a CSS Class

Lesson: Change the Font Size of an Element

Lesson: Set the Font Family of an Element

Lesson: Import a Google Font

Lesson: Specify How Fonts Should Degrade

Lesson: Add Images to your Website

Lesson: Size your Images

Lesson: Add Borders Around your Elements

Lesson: Add Rounded Corners with a Border Radius

Lesson: Make Circular Images with a Border Radius

Lesson: Link to External Pages with Anchor Elements

Lesson: Nest an Anchor Element within a Paragraph

Lesson: Make Dead Links using the Hash Symbol

Lesson: Turn an Image into a Link

Lesson: Add Alt Text to an Image for Accessibility

Lesson: Create a Bulleted Unordered List

Lesson: Create an Ordered List

Lesson: Create a Text Field

Lesson: Add Placeholder Text to a Text Field

Lesson: Create a Form Element

Lesson: Add a Submit Button to a Form

Lesson: Use HTML5 to Require a Field

Lesson: Create a Set of Radio Buttons

Lesson: Create a Set of Checkboxes

Lesson: Check Radio Buttons and Checkboxes by Default

Lesson: Nest Many Elements within a Single Div Element

Lesson: Give a Background Color to a Div Element

Lesson: Set the ID of an Element

Lesson: Use an ID Attribute to Style an Element

Lesson: Adjusting the Padding of an Element

Lesson: Adjust the Margin of an Element

Lesson: Add a Negative Margin to an Element

Lesson: Add Different Padding to Each Side of an Element

Lesson: Add Different Margins to Each Side of an Element

Lesson: Use Clockwise Notation to Specify the Padding of an Element

Lesson: Use Clockwise Notation to Specify the Margin of an Element

Lesson: Style the HTML Body Element

Lesson: Inherit Styles from the Body Element

Lesson: Prioritize One Style Over Another

Lesson: Override Styles in Subsequent CSS

Lesson: Override Class Declarations by Styling ID Attributes

Lesson: Override Class Declarations with Inline Styles

Lesson: Override All Other Styles by using Important

Lesson: Use Hex Code for Specific Colors

Lesson: Use Hex Code to Color Elements White

Lesson: Use Hex Code to Color Elements Red

Lesson: Use Hex Code to Color Elements Green

Lesson: Use Hex Code to Color Elements Blue

Lesson: Use Hex Code to Mix Colors

Lesson: Use Hex Code to Color Elements Gray

Lesson: Use Hex Code for Specific Shades of Gray

Lesson: Use Abbreviated Hex Code

Lesson: Use RGB values to Color Elements

Lesson: Use RGB to Color Elements White

Lesson: Use RGB to Color Elements Red

Lesson: Use RGB to Color Elements Green

Lesson: Use RGB to Color Elements Blue

Lesson: Use RGB to Mix Colors

Lesson: Use RGB to Color Elements Gray