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<!DOCTYPE html>
<html>
<head>
    <title>Calculator</title>
    <style>
        .calculator {
            width: 200px;
            margin: 0 auto;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
        .result {
            text-align: right;
            margin-bottom: 10px;
            height: 30px;
            line-height: 30px;
            padding: 0 10px;
            background-color: #f8f8f8;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
        .buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 5px;
        }
        .buttons button {
            height: 40px;
            line-height: 40px;
            text-align: center;
            font-size: 18px;
            background-color: #eee;
            border: none;
            border-radius: 5px;
        }
        .buttons button:hover {
            background-color: #ddd;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div class="calculator">
        <div class="result" id="result">0</div>
        <div class="buttons">
            <button onclick="clearResult()">C</button>
            <button onclick="appendNumber('7')">7</button>
            <button onclick="appendNumber('8')">8</button>
            <button onclick="appendNumber('9')">9</button>
            <button onclick="appendOperator('+')">+</button>
            <button onclick="appendNumber('4')">4</button>
            <button onclick="appendNumber('5')">5</button>
            <button onclick="appendNumber('6')">6</button>
            <button onclick="appendOperator('-')">-</button>
            <button onclick="appendNumber('1')">1</button>
            <button onclick="appendNumber('2')">2</button>
            <button onclick="appendNumber('3')">3</button>
            <button onclick="appendOperator('*')">*</button>
            <button onclick="appendNumber('0')">0</button>
            <button onclick="appendOperator('.')">.</button>
            <button onclick="calculateResult()">=</button>
            <button onclick="appendOperator('/')">/</button>
        </div>
    </div>

    <script>
        let result = document.getElementById('result');
        let expression = '';

        function appendNumber(number) {
            expression += number;
            result.textContent = expression;
        }

        function appendOperator(operator) {
            expression += operator;
            result.textContent = expression;
        }

        function calculateResult() {
            try {
                let resultValue = eval(expression);
                result.textContent = resultValue;
                expression = '';
            } catch (error) {
                result.textContent = 'Error';
            }
        }

        function clearResult() {
            expression = '';
            result.textContent = '0';
        }
    </script>
</body>
</html>