HTML-CSS-Project/chapter19.html at main · TulyXPlatform/HTML-CSS-Project · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Chapter 19: CSS Layout</title>
  <link rel="stylesheet" href="style.css">
  <style>
    /* Extra demo CSS */
    .position-demo, .float-demo, .z-index-demo,
    .flex-demo, .grid-demo, .alignment-demo {
      border: 1px dashed #333;
      padding: 10px;
      margin-bottom: 20px;
    }
    .position-box, .float-box, .z-index-box,
    .flex-item, .grid-item, .alignment-box {
      border: 1px solid #333;
      padding: 10px;
      margin: 5px;
    }
    .flex-demo { display: flex; gap: 10px; }
    .grid-demo { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
    .z-index-demo { position: relative; height: 150px; }
    .z-index-box { position: absolute; width: 100px; height: 50px; }
    .alignment-demo { height: 100px; }
  </style>
</head>
<body>
  <h2 class="chapter-header" id="heading">Chapter 19: CSS Layout</h2>

  <!-- 19.1 CSS Position -->
  <div class="tag-section">
    <h3>19.1 CSS Position</h3>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>static (default)</h4>
        <div>
          <div class="position-box" style="background:#f3f3f3;">Static 1</div>
          <div class="position-box" style="background:#e2e3e5;">Static 2</div>
          <div class="position-box" style="background:#d1d3d7;">Static 3</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>relative</h4>
        <div class="position-demo">
          <div class="position-box" style="background:#d4edda;">Normal</div>
          <div class="position-box" style="background:#cce7ff; position:relative; left:30px; top:30px;">Relative</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>absolute</h4>
        <div class="position-demo">
          <div class="position-box" style="background:#f3f3f3; position:relative;">
            Parent (relative)
            <div class="position-box" style="background:#fff3cd; position:absolute; right:30px; top:30px;">Absolute</div>
          </div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>fixed</h4>
        <div style="height:150px; overflow:auto; border:1px dashed #333; padding:10px;">
          <p>Scroll to see the fixed element.</p>
          <div class="position-box" style="background:#f8d7da; position:fixed; bottom:10px; right:10px;">Fixed</div>
          <div style="height:300px;"></div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>sticky</h4>
        <div style="height:200px; overflow:auto; border:1px dashed #333; padding:10px;">
          <div class="position-box" style="background:#e2e3ff; position:sticky; top:0;">Sticky</div>
          <div style="height:400px;"></div>
        </div>
      </div>
    </div>
  </div>

  <!-- 19.2 CSS Float -->
  <div class="tag-section">
    <h3>19.2 CSS Float</h3>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>float left / right</h4>
        <div class="float-demo">
          <div class="float-box" style="float:left; background:#fff3cd;">Left</div>
          <div class="float-box" style="float:right; background:#e2e3ff;">Right</div>
          <p>Lorem ipsum dolor sit amet...</p>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>clear property</h4>
        <div class="float-demo">
          <div class="float-box" style="float:left; background:#fff3cd;">Left</div>
          <div class="float-box" style="float:right; background:#e2e3ff;">Right</div>
          <div style="clear:both;"></div>
          <p>This paragraph clears both floats.</p>
        </div>
      </div>
    </div>
  </div>

  <!-- 19.3 CSS Z-index -->
  <div class="tag-section">
    <h3>19.3 CSS Z-index</h3>
    <div class="tag-demo">
      <div class="head-demo">
        <div class="z-index-demo">
          <div class="z-index-box" style="background:#d4edda; z-index:1; left:20px; top:20px;">z=1</div>
          <div class="z-index-box" style="background:#cce7ff; z-index:2; left:40px; top:40px;">z=2</div>
          <div class="z-index-box" style="background:#fff3cd; z-index:3; left:60px; top:60px;">z=3</div>
        </div>
      </div>
    </div>
  </div>

  <!-- 19.4 CSS Flexbox -->
  <div class="tag-section">
    <h3>19.4 CSS Flexbox</h3>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>Basic Flex</h4>
        <div class="flex-demo">
          <div class="flex-item" style="background:#d4edda;">Item 1</div>
          <div class="flex-item" style="background:#cce7ff;">Item 2</div>
          <div class="flex-item" style="background:#fff3cd;">Item 3</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>justify-content</h4>
        <div class="flex-demo" style="justify-content:space-between;">
          <div class="flex-item" style="background:#d4edda;">1</div>
          <div class="flex-item" style="background:#cce7ff;">2</div>
          <div class="flex-item" style="background:#fff3cd;">3</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>align-items</h4>
        <div class="flex-demo" style="align-items:center; height:100px;">
          <div class="flex-item" style="background:#d4edda; height:40px;">1</div>
          <div class="flex-item" style="background:#cce7ff; height:60px;">2</div>
          <div class="flex-item" style="background:#fff3cd; height:30px;">3</div>
        </div>
      </div>
    </div>
  </div>

  <!-- 19.5 CSS Grid -->
  <div class="tag-section">
    <h3>19.5 CSS Grid</h3>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>Basic Grid</h4>
        <div class="grid-demo">
          <div class="grid-item" style="background:#d4edda;">1</div>
          <div class="grid-item" style="background:#cce7ff;">2</div>
          <div class="grid-item" style="background:#fff3cd;">3</div>
          <div class="grid-item" style="background:#e2e3e5;">4</div>
          <div class="grid-item" style="background:#f8d7da;">5</div>
          <div class="grid-item" style="background:#d1d3d7;">6</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>Grid Areas</h4>
        <div style="display:grid; grid-template-areas:'header header header' 'sidebar main main' 'footer footer footer'; gap:10px; border:1px dashed #333; padding:5px;">
          <div style="grid-area:header; background:#d4edda; border:1px solid #333; padding:10px;">Header</div>
          <div style="grid-area:sidebar; background:#cce7ff; border:1px solid #333; padding:10px;">Sidebar</div>
          <div style="grid-area:main; background:#fff3cd; border:1px solid #333; padding:10px;">Main</div>
          <div style="grid-area:footer; background:#e2e3e5; border:1px solid #333; padding:10px;">Footer</div>
        </div>
      </div>
    </div>
  </div>

  <!-- 19.6 CSS Alignment -->
  <div class="tag-section">
    <h3>19.6 CSS Alignment</h3>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>Horizontal</h4>
        <div class="alignment-demo" style="text-align:center;">
          <div class="alignment-box" style="display:inline-block; background:#d4edda;">Centered</div>
        </div>
        <div class="alignment-demo">
          <div class="alignment-box" style="margin:0 auto; background:#cce7ff;">Auto Margin</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>Vertical</h4>
        <div class="alignment-demo" style="display:flex; align-items:center;">
          <div class="alignment-box" style="background:#fff3cd;">Flex Center</div>
        </div>
        <div class="alignment-demo" style="position:relative;">
          <div class="alignment-box" style="background:#e2e3e5; position:absolute; top:50%; transform:translateY(-50%);">Absolute Center</div>
        </div>
      </div>
    </div>

    <div class="tag-demo">
      <div class="head-demo">
        <h4>Perfect Centering</h4>
        <div style="display:flex; justify-content:center; align-items:center; height:100px; border:1px dashed #333;">
          <div class="alignment-box" style="background:#f8d7da;">Perfect Center</div>
        </div>
      </div>
    </div>
  </div>

</body>
</html>