body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000000;
    margin: 0;
    background-image: url(image.jpg);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

.calculator {
    background-color: #2d90ecb9;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 0 10px rgba(247, 247, 247, 0.5);
    text-align: center;
    width: 320px;
}

.display {
    background-color: #635a5a;
    color: #000000;
    font-size: 20px;
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 20px;
    min-height: 50px;
    text-align: right;
}

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

.button {
    border: 1px solid #ccc;
    border-radius: 50%;
    padding: 20px;
    background-color: #f1f1f1;
    font-size: 18px;
    color: #333;
    cursor: pointer;
}

.button.dark-gray {
    background-color: #3c7d81;
    color: #000000;
}

.button.orange {
    background-color: #686565;
    color: black;
}

.button.light-gray {
    background-color: #3c7d81;
    color: black;
}

.button-wide {
    grid-column: span 2;
    border-radius: 50px;
}