diff --git a/index.html b/index.html
index fed6746..0ad1297 100644
--- a/index.html
+++ b/index.html
@@ -1,46 +1,338 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
-    <!-- Metadata -->
     <meta charset="UTF-8">
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <meta name="description" content="Hello World">
-    <meta name="author" content="AI">
-
-    <!-- SEO & Social -->
-    <meta property="og:title" content="Hello World Page">
-    <meta property="og:description" content="An page that prints Hello World">
-    <meta property="og:type" content="website">
-    <meta name="twitter:card" content="summary">
-
-    <!-- Favicon -->
-    <link rel="icon" href="https://www.de-roo.org/favicon.ico" type="image/x-icon">
-
-    <!-- Google Fonts -->
-    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap" rel="stylesheet">
-
-    <title>Hello World</title>
-
-    <!-- Custom Styles -->
+    <title>Calculator</title>
     <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
         body {
-            font-family: 'Roboto', sans-serif;
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
             display: flex;
             justify-content: center;
             align-items: center;
-            height: 100vh;
-            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
-            margin: 0;
+            min-height: 100vh;
+            overflow: hidden;
         }
-        h1 {
-            font-size: 4rem;
-            color: #333;
+
+        .calculator {
+            background: #2d3748;
+            border-radius: 20px;
+            padding: 30px;
+            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
+            width: 400px;
+        }
+
+        .display {
+            background: #1a202c;
+            border-radius: 10px;
+            padding: 20px;
+            margin-bottom: 20px;
+            text-align: right;
+            min-height: 100px;
+            display: flex;
+            flex-direction: column;
+            justify-content: flex-end;
+        }
+
+        .equation {
+            color: #a0aec0;
+            font-size: 18px;
+            min-height: 25px;
+            margin-bottom: 10px;
+        }
+
+        .current {
+            color: #fff;
+            font-size: 36px;
+            font-weight: 600;
+        }
+
+        .buttons {
+            display: grid;
+            grid-template-columns: repeat(4, 1fr);
+            gap: 12px;
+        }
+
+        button {
+            padding: 24px;
+            font-size: 20px;
+            font-weight: 600;
+            border: none;
+            border-radius: 10px;
+            cursor: pointer;
+            transition: all 0.2s;
+            color: #fff;
+        }
+
+        button:hover {
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+        }
+
+        button:active {
+            transform: translateY(0);
+        }
+
+        .number {
+            background: #4a5568;
+        }
+
+        .operator {
+            background: #ed8936;
+        }
+
+        .clear {
+            background: #e53e3e;
+            grid-column: span 2;
+        }
+
+        .equals {
+            background: #48bb78;
+            grid-column: span 2;
+        }
+
+        .bsod {
+            display: none;
+            position: fixed;
+            top: 0;
+            left: 0;
+            width: 100vw;
+            height: 100vh;
+            background: #0078d7;
+            color: white;
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+            z-index: 9999;
+            padding: 60px;
+            overflow: hidden;
+        }
+
+        .bsod.show {
+            display: flex;
+            flex-direction: column;
+            justify-content: center;
+        }
+
+        .bsod-content {
+            max-width: 800px;
+        }
+
+        .sad-face {
+            font-size: 120px;
+            margin-bottom: 40px;
+        }
+
+        .bsod h1 {
+            font-size: 48px;
+            font-weight: 400;
+            margin-bottom: 30px;
+        }
+
+        .bsod p {
+            font-size: 20px;
+            line-height: 1.6;
+            margin-bottom: 20px;
+        }
+
+        .progress {
+            margin: 40px 0;
+            font-size: 18px;
+        }
+
+        .error-details {
+            margin-top: 40px;
+            font-size: 14px;
+            opacity: 0.8;
+        }
+
+        .restart-btn {
+            display: none;
+            margin-top: 30px;
+            padding: 15px 40px;
+            font-size: 18px;
+            background: white;
+            color: #0078d7;
+            border: none;
+            cursor: pointer;
+            border-radius: 5px;
+            font-weight: 600;
+        }
+
+        .restart-btn.show {
+            display: inline-block;
+        }
+
+        .restart-btn:hover {
+            background: #f0f0f0;
         }
     </style>
 </head>
 <body>
-    <h1>Hello World</h1>
+    <div class="calculator">
+        <div class="display">
+            <div class="equation" id="equation"></div>
+            <div class="current" id="current">0</div>
+        </div>
+        <div class="buttons">
+            <button class="clear" onclick="clearCalculator()">C</button>
+            <button class="operator" onclick="appendOperator('/')">/</button>
+            <button class="operator" onclick="appendOperator('*')">×</button>
+            
+            <button class="number" onclick="appendNumber('7')">7</button>
+            <button class="number" onclick="appendNumber('8')">8</button>
+            <button class="number" onclick="appendNumber('9')">9</button>
+            <button class="operator" onclick="appendOperator('-')">-</button>
+            
+            <button class="number" onclick="appendNumber('4')">4</button>
+            <button class="number" onclick="appendNumber('5')">5</button>
+            <button class="number" onclick="appendNumber('6')">6</button>
+            <button class="operator" onclick="appendOperator('+')">+</button>
+            
+            <button class="number" onclick="appendNumber('1')">1</button>
+            <button class="number" onclick="appendNumber('2')">2</button>
+            <button class="number" onclick="appendNumber('3')">3</button>
+            <button class="number" onclick="appendNumber('0')">0</button>
+            
+            <button class="number" onclick="appendNumber('.')">.</button>
+            <button class="equals" onclick="triggerBSOD()">=</button>
+        </div>
+    </div>
 
+    <div class="bsod" id="bsod">
+        <div class="bsod-content">
+            <div class="sad-face">:(</div>
+            <h1>Your PC ran into a problem and needs to restart.</h1>
+            <p>We're just collecting some error info, and then we'll restart for you.</p>
+            <div class="progress">
+                <span id="progress">0</span>% complete
+            </div>
+            <div class="error-details">
+                <p>If you'd like to know more, you can search online later for this error: CALCULATOR_OVERFLOW</p>
+                <p>Stop code: 0x0000007B (0x00000034, 0xC0000034, 0x00000000, 0x00000000)</p>
+                <p>What failed: math.sys</p>
+            </div>
+            <button class="restart-btn" id="restartBtn" onclick="location.reload()">Restart</button>
+        </div>
+    </div>
+
+    <script>
+        let currentValue = '0';
+        let previousValue = '';
+        let operation = '';
+        let shouldResetScreen = false;
+
+        function updateDisplay() {
+            document.getElementById('current').textContent = currentValue;
+            let equationText = previousValue;
+            if (operation) {
+                equationText += ' ' + operation;
+            }
+            document.getElementById('equation').textContent = equationText;
+        }
+
+        function appendNumber(num) {
+            if (currentValue === '0' || shouldResetScreen) {
+                currentValue = num;
+                shouldResetScreen = false;
+            } else {
+                currentValue += num;
+            }
+            updateDisplay();
+        }
+
+        function appendOperator(op) {
+            if (operation && !shouldResetScreen) {
+                calculate();
+            }
+            previousValue = currentValue;
+            operation = op;
+            shouldResetScreen = true;
+            updateDisplay();
+        }
+
+        function calculate() {
+            const prev = parseFloat(previousValue);
+            const current = parseFloat(currentValue);
+            
+            if (isNaN(prev) || isNaN(current)) return;
+            
+            let result;
+            switch (operation) {
+                case '+':
+                    result = prev + current;
+                    break;
+                case '-':
+                    result = prev - current;
+                    break;
+                case '*':
+                    result = prev * current;
+                    break;
+                case '/':
+                    result = prev / current;
+                    break;
+                default:
+                    return;
+            }
+            
+            currentValue = result.toString();
+            operation = '';
+            previousValue = '';
+            shouldResetScreen = true;
+            updateDisplay();
+        }
+
+        function clearCalculator() {
+            currentValue = '0';
+            previousValue = '';
+            operation = '';
+            shouldResetScreen = false;
+            updateDisplay();
+        }
+
+        function triggerBSOD() {
+            const bsod = document.getElementById('bsod');
+            const progressElement = document.getElementById('progress');
+            const restartBtn = document.getElementById('restartBtn');
+            
+            bsod.classList.add('show');
+            
+            let progress = 0;
+            const interval = setInterval(() => {
+                progress += Math.floor(Math.random() * 8) + 1;
+                if (progress >= 100) {
+                    progress = 100;
+                    clearInterval(interval);
+                    setTimeout(() => {
+                        restartBtn.classList.add('show');
+                    }, 500);
+                }
+                progressElement.textContent = progress;
+            }, 200);
+        }
+
+        // Keyboard support
+        document.addEventListener('keydown', (e) => {
+            if (e.key >= '0' && e.key <= '9') {
+                appendNumber(e.key);
+            } else if (e.key === '.') {
+                appendNumber('.');
+            } else if (e.key === '+' || e.key === '-' || e.key === '*' || e.key === '/') {
+                appendOperator(e.key);
+            } else if (e.key === 'Enter' || e.key === '=') {
+                e.preventDefault();
+                triggerBSOD();
+            } else if (e.key === 'Escape' || e.key === 'c' || e.key === 'C') {
+                clearCalculator();
+            }
+        });
+
+        updateDisplay();
+    </script>
 </body>
 </html>
\ No newline at end of file
