/* styles.css */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #f4f4f4;
}
.calculator {
    background: #000;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}
#display {
    width: 100%;
    padding: 15px 0px 15px 0px;
    font-size: 24px;
    text-align: center;
    border: none;
    background: #eee;
    margin-bottom: 10px;
    border-radius: 5px;
}
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}
button {
    padding: 15px;
    font-size: 20px;
    border: none;
    background: #323232;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}
button:hover {
    background: #FFA500;
}
.zero {
    grid-column: span 2;
}