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
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>选择器与文本样式</title>
<link rel="stylesheet" href="./answer.css" />
</head>
<body>
<div class="card">
<h1>CSS 入门练习</h1>
<p class="intro">CSS 负责页面的视觉和布局。你现在要做的是把这段内容排得更清晰。</p>
<p class="note">练习重点:选择器、颜色、字号、行高。</p>
<h2>本次任务</h2>
<ul>
<li>调整页面背景</li>
<li class="important">强调主标题和重点项</li>
<li>让段落更容易阅读</li>
</ul>
</div>
</body>
</html>