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.
This commit is contained in:
chali
2026-03-09 14:16:22 +08:00
commit 4495ae0e28
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Fixed 与 Sticky</title>
<link rel="stylesheet" href="./answer.css" />
</head>
<body>
<a class="help" href="#">帮助</a>
<section class="page">
<header class="topbar">学习导航</header>
<div class="content">
<p>向下滚动时观察导航位置。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
<p>这里放一些占位内容。</p>
</div>
</section>
</body>
</html>