How to create a Dark Mode - Light Mode Calculator in Javascript and CSS

Learn with us how to create a Dark Mode - Light Mode Calculator in Javascript and CSS!

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Contents:
1. HTML Code
2. CSS Code
3. Javascript Code

Get your code ⬇️

1. HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Black & White Calculator</title>
</head>
<body>
<div class="container">
<div class="calculator dark">
<div class="theme-toggler active">
<i class="toggler-icon"></i>
</div>
<div class="display-screen">
<div id="display"></div>
</div>
<div class="buttons">
<table>
<tr>
<td><button class="btn-operator" id="clear">C</button></td>
<td><button class="btn-operator" id="/">&divide;</button></td>
<td><button class="btn-operator" id="*">&times;</button></td>
<td><button class="btn-operator" id="backspace"><</button></td>
</tr>
<tr>
<td><button class="btn-number" id="7">7</button></td>
<td><button class="btn-number" id="8">8</button></td>
<td><button class="btn-number" id="9">9</button></td>
<td><button class="btn-operator" id="-">-</button></td>
</tr>
<tr>
<td><button class="btn-number" id="4">4</button></td>
<td><button class="btn-number" id="5">5</button></td>
<td><button class="btn-number" id="6">6</button></td>
<td><button class="btn-operator" id="+">+</button></td>
</tr>
<tr>
<td><button class="btn-number" id="1">1</button></td>
<td><button class="btn-number" id="2">2</button></td>
<td><button class="btn-number" id="3">3</button></td>
<td rowspan="2"><button class="btn-equal" id="equal">=</button></td>
</tr>
<tr>
<td><button class="btn-operator" id="(">(</button></td>
<td><button class="btn-number" id="0">0</button></td>
<td><button class="btn-operator" id=")">)</button></td>
</tr>
</table>
</div>
</div>
</div>
<script src="script.js"></script>
</body>
</html>

2. CSS Code

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    outline: 0;
    transition: all 0.5s ease;
    }
    body{
    font-family: sans-serif;
    }
    a{
    text-decoration: none;
    color: #fff;
    }
    body{
    background: rgb(238,174,202);
background: radial-gradient(circle, rgba(238,174,202,1) 0%, rgba(148,187,233,1) 100%);
    }
    .container{
    height: 100vh;
    width: 100vw;
    display: grid;
    place-items: center;
    }
    .calculator{
    position: relative;
    height: auto;
    width: auto;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 30px #8a817c;
    }
    .theme-toggler{
    position: absolute;
    top: 30px;
    right: 30px;
    color: #fff;
    cursor: pointer;
    z-index: 1;
    }
    .theme-toggler.active{
    color: #333;
    }
    .theme-toggler.active::before{
    background-color: #fff;
    }
    .theme-toggler::before{
    content: '';
    height: 30px;
    width: 30px;
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background-color: #333;
    z-index: -1;
    }
    #display{
    margin: 0 10px;
    height: 150px;
    width: auto;
    max-width: 270px;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    font-size: 30px;
    margin-bottom: 20px;
    overflow-x: scroll;
    }
    #display::-webkit-scrollbar{
    display: block;
    height: 3px;
    }
    button{
    height: 60px;
    width: 60px;
    border: 0;
    border-radius: 30px;
    margin: 5px;
    font-size: 20px;
    cursor: pointer;
    transition: all 200ms ease;
    }
    button:hover{
    transform: scale(1.1);
    }
    button#equal{
    height: 130px;
    }
    /* light theme */
    .calculator{
    background-color: #fbfefb;
    }
    .calculator #display{
    color: #0a1e23;
    }
    .calculator button#clear{
    background-color: #db7f8e;
    color: #ffdbda;
    }
    .calculator button.btn-number{
    background-color: #339989;
    color: #7de2d1;
    }
    .calculator button.btn-operator{
    background-color: #b6a6ca;
    color: #f1e4f3;
    }
    .calculator button.btn-equal{
    background-color: #19647e;
    color: #eee5e5;
    }
    /* dark theme */
    .calculator.dark{
    background-color: #071115;
    }
    .calculator.dark #display{
    color: #f8fafd;
    }
    .calculator.dark button#clear{
    background-color: #785964;
    color: #d5c7bc;
    }
    .calculator.dark button.btn-number{
    background-color: #3a606e;
    color: #f8fafb;
    }
    .calculator.dark button.btn-operator{
    background-color: #afbfc0;
    color: #4e8098;
    }
    .calculator.dark button.btn-equal{
    background-color: #566246;
    }

3. Javascript Code

const display = document.querySelector('#display');
const buttons = document.querySelectorAll('button');
buttons.forEach((item) => {
item.onclick = () => {
if (item.id == 'clear') {
display.innerText = '';
} else if (item.id == 'backspace') {
let string = display.innerText.toString();
display.innerText = string.substr(0, string.length - 1);
}else if (display.innerText != '' && item.id == 'equal') {
display.innerText = eval(display.innerText);
}else if (display.innerText == '' && item.id == 'equal') {
display.innerText = 'Empty!';
setTimeout(() => (display.innerText = ''), 2000);
}else {
display.innerText += item.id;
}
}
})
const themeToggleBtn = document.querySelector('.theme-toggler');
const calculator = document.querySelector('.dark');
const toggleIcon = document.querySelector('.toggler-icon');
let isDark = true;
themeToggleBtn.onclick = () => {
calculator.classList.toggle('dark');
themeToggleBtn.classList.toggle('active');
isDark = !isDark;
}

I hope you did find this tutorial useful!

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