/* style.css */
body {
    background-color: #121212;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.calculator {
    background: #2e2e2e;
    padding: 20px 30px;
    border-radius: 15px;
    box-shadow: 0 0 20px #000;
    width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#display {
    width: 100%;
    height: 60px;
    background: #1e1e1e;
    color: #00ffcc;
    font-size: 24px;
    text-align: right;
    border: none;
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 8px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    width: 100%;
}

button {
    padding: 20px;
    font-size: 20px;
    background: #3c3c3c;
    border: none;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #555;
}