body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
.container {
    max-width: 400px;
    margin: 0 auto;
    width: 300px;
    background-color: white; 
    border: 1px solid #ccc; 
    border-radius: 10px; 
    padding: 20px;
    margin: 20px auto;
    box-shadow: 0 2px 4px black; 
    text-align: center; 
}
label {
    display: block;
    margin: 10px 0 5px;
}
input[type="number"], select {
    width: 100%;
    padding: 8px;
    margin-bottom: 15px;
}
button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #45a049;
}
.result {
    margin-top: 20px;
}