body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
}
.calculator {
    border: 1px solid #000;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0px 0px 10px rgba(0,0,0,0.1);
    width: 300px;
    background-color: #D3D3D3; /* Vaaleanharmaa */
}
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 20px;
}
button {
    padding: 10px;
    border: none;
    border-radius: 5px;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    background-color: #007bff;
}
button:hover {
    background-color: #0056b3;
    transform: scale(1.1); /* Korostettu ulkoasu */
}
#display {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 20px;
    font-size: 18px;
    background-color: white;
}