<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Mobile Calculator</title>
<style>
*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial, sans-serif;
}
body{
height:100vh;
display:flex;
justify-content:center;
align-items:center;
background:#111827;
}
.calculator{
width:320px;
background:#1f2937;
padding:20px;
border-radius:30px;
box-shadow:0 0 30px rgba(0,0,0,0.5);
}
#display{
width:100%;
height:80px;
border:none;
outline:none;
border-radius:20px;
background:#374151;
color:white;
text-align:right;
font-size:38px;
padding:20px;
margin-bottom:20px;
}
.buttons{
display:grid;
grid-template-columns:repeat(4,1fr);
gap:12px;
}
button{
height:65px;
border:none;
border-radius:18px;
font-size:24px;
cursor:pointer;
background:#4b5563;
color:white;
}
button:hover{
opacity:0.8;
}
.operator{
background:orange;
}
.equal{
background:#10b981;
}
.zero{
grid-column:span 2;
}
</style>
</head>
<body>
<div class="calculator">
<input type="text" id="display">
<div class="buttons">
<button class="operator" onclick="clearDisplay()">C</button>
<button class="operator" onclick="deleteLast()">⌫</button>
<button class="operator" onclick="appendValue('%')">%</button>
<button class="operator" onclick="appendValue('/')">÷</button>
<button onclick="appendValue('7')">7</button>
<button onclick="appendValue('8')">8</button>
<button onclick="appendValue('9')">9</button>
<button class="operator" onclick="appendValue('*')">×</button>
<button onclick="appendValue('4')">4</button>
<button onclick="appendValue('5')">5</button>
<button onclick="appendValue('6')">6</button>
<button class="operator" onclick="appendValue('-')">−</button>
<button onclick="appendValue('1')">1</button>
<button onclick="appendValue('2')">2</button>
<button onclick="appendValue('3')">3</button>
<button class="operator" onclick="appendValue('+')">+</button>
<button class="zero" onclick="appendValue('0')">0</button>
<button onclick="appendValue('.')">.</button>
<button class="equal" onclick="calculate()">=</button>
</div>
</div>
<script>
let display = document.getElementById("display");
function appendValue(value){
display.value += value;
}
function clearDisplay(){
display.value = "";
}
function deleteLast(){
display.value = display.value.slice(0,-1);
}
function calculate(){
try{
display.value = eval(display.value);
}
catch{
display.value = "Error";
}
}
</script>
</body>
</html>