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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>Embedded CSS Example</title>
+    <style>
+        /* --- REUSABLE UTILITY CLASSES --- */
+        
+        /* Flexbox center utility */
+        .flex-center {
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            min-height: 100vh;
+            margin: 0;
+            font-family: Arial, sans-serif;
+            background-color: #f4f7f6;
+        }
+
+        /* Card Component */
+        .card {
+            background-color: #ffffff;
+            padding: 24px;
+            border-radius: 8px;
+            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+            max-width: 400px;
+            text-align: center;
+        }
+
+        /* Base Button */
+        .btn {
+            display: inline-block;
+            padding: 12px 24px;
+            font-size: 16px;
+            font-weight: bold;
+            text-decoration: none;
+            border-radius: 6px;
+            border: none;
+            cursor: pointer;
+            transition: background-color 0.3s ease;
+        }
+
+        /* Button Modifiers for Reusability */
+        .btn-primary {
+            background-color: #007bff;
+            color: #ffffff;
+        }
+        
+        .btn-primary:hover {
+            background-color: #0056b3;
+        }
+
+        .btn-secondary {
+            background-color: #6c757d;
+            color: #ffffff;
+            margin-left: 10px;
+        }
+
+        .btn-secondary:hover {
+            background-color: #5a6268;
+        }
+    </style>
+</head>
+<body class="flex-center">
+
+    <div class="card">
+        <h2>Welcome Back</h2>
+        <p>This is a reusable embedded CSS setup. Both buttons below share the base <strong>.btn</strong> rule, but use different modifiers.</p>
+        
+        <div style="margin-top: 20px;">
+            <a href="#" class="btn btn-primary">Sign In</a>
+            <a href="#" class="btn btn-secondary">Learn More</a>
+        </div>
+    </div>
+
+</body>
+</html>
+