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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>Modern CSS Units Demo</title>
+    <style>
+        /* 1. Root Definition: Using px to establish a base size */
+        :root {
+            font-size: 16px; /* Base size for root (1rem = 16px) */
+        }
+
+        /* Reset and Box Sizing */
+        * {
+            box-sizing: border-box;
+            margin: 0;
+            padding: 0;
+        }
+
+        body {
+            font-family: Arial, sans-serif;
+            color: #333;
+        }
+
+        /* 2. Viewport Height & Width: vh, vw */
+        .hero {
+            height: 80vh; /* Takes up 80% of the viewport height */
+            width: 100vw;  /* Takes up 100% of the viewport width */
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            display: flex;
+            flex-direction: column;
+            justify-content: center;
+            align-items: center;
+            text-align: center;
+            color: white;
+            padding: 2rem;
+        }
+
+        /* 3. Root em (rem): rem for scalable typography */
+        .hero h1 {
+            font-size: 3rem; /* 3 x 16px = 48px */
+            margin-bottom: 1rem; /* 1 x 16px = 16px */
+        }
+
+        .hero p {
+            font-size: 1.25rem; /* 1.25 x 16px = 20px */
+            max-width: 60ch; /* Limits the width to about 60 characters for readability */
+        }
+
+        /* 4. Content Area */
+        .content {
+            padding: 3rem 5%; /* Padding utilizes rem and percentage */
+            max-width: 1200px; /* Absolute max-width constraint */
+            margin: 0 auto;
+        }
+
+        /* 5. Em unit: em for element-specific relative sizing */
+        .card {
+            background-color: #f9f9f9;
+            border: 1px solid #ddd;
+            padding: 2em; /* Padding is relative to the card's own font-size */
+            margin-bottom: 2rem;
+            border-radius: 0.5em; /* Border radius scales with the card's font */
+        }
+
+        .card h2 {
+            font-size: 2em; /* 2 x card base font-size */
+            margin-bottom: 0.5em;
+        }
+
+        .card p {
+            font-size: 1em; /* Matches the card base font-size */
+            line-height: 1.6;
+        }
+
+        /* 6. Percentage (%) and Pixels (px) */
+        .image-container {
+            width: 100%; /* Takes 100% of the parent card's width */
+            max-width: 400px; /* Max width constraint in pixels */
+            margin: 1rem auto 0 auto;
+        }
+
+        .image-container img {
+            max-width: 100%;
+            height: auto;
+            border-radius: 8px; /* Strict absolute unit for rounding */
+	        display: block; /* Removes unwanted baseline spacing */
+        }
+    </style>
+</head>
+<body>
+
+    <div class="hero">
+        <h1>Responsive Layout with CSS Units</h1>
+        <p>This section uses <strong>vh</strong> for height and <strong>vw</strong> for width. The typography uses <strong>rem</strong> and <strong>ch</strong>.</p>
+    </div>
+
+    <div class="content">
+        <div class="card">
+            <h2>The Card Heading</h2>
+            <p>This card's padding and margins scale relative to its own font-size using the <strong>em</strong> unit. The card width is controlled by percentages and absolute pixels.</p>
+            <div class="image-container">
+                <!-- Using percentage and px for sizing -->
+		<a href="https://www.adhikarana.org/" target="_blank"><img src="images/hulftsdorp.jpg" alt="Hulftsdorp, Colombo">
+            </div>
+        </div>
+    </div>
+
+</body>
+</html>
+