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Responsive Colorful Calculator App

Aug 12, 2026

About this app

A responsive colorful calculator app with clear display of results and user-friendly interface.

Responsive Colorful Calculator App 7 8 9 / 4 5 6 * 1 2 3 - 0 C = + . ( ) %

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Source

                    <html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">

<title>Responsive Colorful Calculator App</title>
<meta name="description" content="A responsive colorful calculator app with clear display of results and user-friendly interface.">
<meta name="keywords" content="calculator, colors, math, results, mobile app, fun interface">

<style>
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

body {
background-color: #FFFFFF;
font-family: 'Roboto', sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
#main-container {
aspect-ratio: 16 / 9;
padding: 20px;
box-shadow: 0 0 10px rgba(0,0,0,0.1);
border-radius: 10px;
background-color: #FFFFFF;
display: flex;
flex-direction: column;
}
#display {
background-color: #FFFFFF;
border: none;
padding: 20px;
font-size: 3rem;
text-align: right;
color: #2E7D32; /* Green for answer */
margin-bottom: 20px;
flex-grow: 1;
}
.calc-button {
font-size: 2rem;
background-color: #FFFFFF; /* White background */
color: black; /* Black text for numbers/symbols */
border: none;
margin: 5px;
padding: 15px;
flex: 1;
transition: background-color 0.3s;
min-width: 70px;
}
.calc-button:hover {
background-color: #f0f0f0; /* Light grey on hover */
}
#error-display {
color: red;
font-size: 1.5rem;
text-align: center;
}
.d-flex {
display: flex;
flex-wrap: wrap;
}
.row {
display: flex;
justify-content: space-between;
margin: 10px 0;
}
</style>

<script>
document.addEventListener("DOMContentLoaded", function () {
const btns = document.querySelectorAll('.calc-button');
const display = document.getElementById('display');
const errorDisplay = document.getElementById('error-display');

let currentInput = '';

btns.forEach(btn => {
btn.addEventListener('click', function () {
const value = btn.innerText;

if (value === '=') {
try {
const result = eval(currentInput);
display.innerText = result;
errorDisplay.innerText = '';
currentInput = '' + result;
} catch (e) {
errorDisplay.innerText = 'Error';
display.innerText = '';
currentInput = '';
}
} else if (value === 'C') {
currentInput = '';
display.innerText = '';
errorDisplay.innerText = '';
} else {
currentInput += value;
display.innerText = currentInput;
}
});
});
});
</script>
</head>
<body>
<div id="main-container" class="container">
<div id="display"></div>
<div id="error-display"></div>
<div class="d-flex">
<div class="row">
<button class="calc-button">7</button>
<button class="calc-button">8</button>
<button class="calc-button">9</button>
<button class="calc-button">/</button>
</div>
<div class="row">
<button class="calc-button">4</button>
<button class="calc-button">5</button>
<button class="calc-button">6</button>
<button class="calc-button">*</button>
</div>
<div class="row">
<button class="calc-button">1</button>
<button class="calc-button">2</button>
<button class="calc-button">3</button>
<button class="calc-button">-</button>
</div>
<div class="row">
<button class="calc-button">0</button>
<button class="calc-button">C</button>
<button class="calc-button">=</button>
<button class="calc-button">+</button>
</div>
<div class="row">
<button class="calc-button">.</button>
<button class="calc-button">(</button>
<button class="calc-button">)</button>
<button class="calc-button">%</button>
</div>
</div>
</div>
</body>
</html>