body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #000; /* Black background outside */
}

.container {
    background-color: #121212; /* Dark background for the box */
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.8); /* Adds shadow to make it stand out */
}

.calculator {
    background-color: #1d1d1d;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.5);
    text-align: center;
    width: 300px; /* Adjust width to fit buttons */
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 400px; /* Adjust height to make room for the operators at the bottom */
}

#display {
    width: 100%;
    height: 40px;
    text-align: right;
    margin-bottom: 20px;
    font-size: 20px;
    padding: 10px;
    border-radius: 5px;
    border: none;
    background-color: #333;
    color: white;
}

.numbers {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.operators {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

button {
    width: 50px;
    height: 50px;
    font-size: 18px;
    border-radius: 5px;
    background-color: #333;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #444;
}