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index.html
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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>Simple Calculator</title>
<style>
body {
font-family: Arial, sans-serif;
background-color: #f3f4f6;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.calculator {
background-color: #fff;
border-radius: 10px;
box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
padding: 20px;
width: 300px;
}
.display {
font-size: 2em;
background-color: #f9f9f9;
border: none;
border-radius: 5px;
padding: 10px;
text-align: right;
margin-bottom: 10px;
width: 100%;
box-sizing: border-box;
}
.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 10px;
}
.button {
font-size: 1.5em;
padding: 15px;
background-color: #007bff;
color: white;
border: none;
border-radius: 5px;
cursor: pointer;
text-align: center;
}
.button:active {
background-color: #0056b3;
}
.button.clear {
background-color: #dc3545;
}
.button.equals {
background-color: #28a745;
grid-column: span 2;
}
</style>
</head>
<body>
<div class="calculator">
<input type="text" class="display" id="display" disabled>
<div class="buttons">
<button class="button" onclick="appendValue('7')">7</button>
<button class="button" onclick="appendValue('8')">8</button>
<button class="button" onclick="appendValue('9')">9</button>
<button class="button" onclick="appendValue('/')">/</button>
<button class="button" onclick="appendValue('4')">4</button>
<button class="button" onclick="appendValue('5')">5</button>
<button class="button" onclick="appendValue('6')">6</button>
<button class="button" onclick="appendValue('*')">×</button>
<button class="button" onclick="appendValue('1')">1</button>
<button class="button" onclick="appendValue('2')">2</button>
<button class="button" onclick="appendValue('3')">3</button>
<button class="button" onclick="appendValue('-')">−</button>
<button class="button" onclick="appendValue('0')">0</button>
<button class="button" onclick="appendValue('.')">.</button>
<button class="button equals" onclick="calculate()">=</button>
<button class="button" onclick="appendValue('+')">+</button>
<button class="button clear" onclick="clearDisplay()">C</button>
</div>
</div>
<script>
const display = document.getElementById('display');
function appendValue(value) {
display.value += value;
}
function calculate() {
try {
display.value = eval(display.value) || '';
} catch {
display.value = 'Error';
}
}
function clearDisplay() {
display.value = '';
}
</script>
</body>
</html>