feat: Add CSS layout exercises and corresponding HTML files

- Created multiple exercises under the CSS layout section, including:
  - Final page layout with CSS styles and HTML structure.
  - Display and flow concepts with examples of block, inline, and none display types.
  - Selectors and pseudo-classes with practical examples.
  - Overflow and sizing handling in CSS.
  - Grid layout basics for two-dimensional layouts.
  - Fixed and sticky positioning examples.
  - Centering techniques for common layout scenarios.

- Added README files for each exercise to outline objectives and file structures.
- Updated main README to include new sections and usage instructions.
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chali
2026-03-09 14:16:22 +08:00
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# 练习 6Display 与文档流
## 目标
理解 `block``inline``inline-block``none` 和默认文档流。
## 文件
- [starter.html](/Volumes/Macintosh HD 1/home/front-end-example/02-css-layout/06-display-and-flow/starter.html)
- [starter.css](/Volumes/Macintosh HD 1/home/front-end-example/02-css-layout/06-display-and-flow/starter.css)
- [answer.html](/Volumes/Macintosh HD 1/home/front-end-example/02-css-layout/06-display-and-flow/answer.html)
- [answer.css](/Volumes/Macintosh HD 1/home/front-end-example/02-css-layout/06-display-and-flow/answer.css)