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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./style.css">
    <title>Andev Web</title>
</head>
<body>
  <div class="container">
    <input type="text" class="display" readonly />
  
    <div class="buttons">
      <button class="operator" data-value="AC">AC</button>
      <button class="operator" data-value="DEL">DEL</button>
      <button class="operator" data-value="%">%</button>
      <button class="operator" data-value="/">/</button>
  
      <button data-value="7">7</button>
      <button data-value="8">8</button>
      <button data-value="9">9</button>
      <button class="operator" data-value="*">*</button>
  
      <button data-value="4">4</button>
      <button data-value="5">5</button>
      <button data-value="6">6</button>
      <button class="operator" data-value="-">-</button>
  
      <button data-value="1">1</button>
      <button data-value="2">2</button>
      <button data-value="3">3</button>
      <button class="operator" data-value="+">+</button>
  
      <button data-value="0">0</button>
      <button data-value="00">00</button>
      <button data-value=".">.</button>
      <button class="operator" data-value="=">=</button>
    </div>
  </div>

CSS

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e0e3eb;
}

.container {
  position: relative;
  max-width: 300px;
  width: 100%;
  border-radius: 12px;
  padding: 10px 20px 20px;
  background: #fff;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.05);
}

.display {
  height: 80px;
  width: 100%;
  outline: none;
  border: none;
  text-align: right;
  margin-bottom: 10px;
  font-size: 25px;
  color: #000e1a;
  background-color: #f1f1f1;
  pointer-events: none;
  caret-color: transparent;
  border-radius: 10px;
  padding: 15px 20px;
}

.buttons {
  display: grid;
  grid-gap: 10px;
  grid-template-columns: repeat(4, 1fr);
}

.buttons button {
  padding: 10px;
  border-radius: 6px;
  border: none;
  font-size: 20px;
  cursor: pointer;
  background-color: #eee;
  transition: background-color 0.3s ease;
}

.buttons button:hover {
  background-color: #d3d3d3;
}

.buttons button:active {
  transform: scale(0.99);
}

.operator {
  color: #2f9fff;
}

const display = document.querySelector(".display");
const buttons = document.querySelectorAll("button");
const specialChars = ["%", "*", "/", "-", "+", "="];
let output = "";

buttons.forEach((button) => {
  button.addEventListener("click", (e) => calculate(e.target.dataset.value));
});

document.addEventListener("keydown", (event) => {
  const key = event.key;
  const allowedKeys = [...Array(10).keys(), ".", "Enter", "Backspace", "%", "*", "/", "-", "+"];
  
  if (allowedKeys.includes(key) || key === "Backspace") {
    let value = key === "Enter" ? "=" : key;
    value = key === "Backspace" ? "DEL" : value;
    calculate(value);
  }
});