body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 20px;
    background-color: #f4f4f4;
}

h2 {
    color: #333;
}

form {
    max-width: 400px;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

form label {
    display: block;
    text-align: left;
    margin-top: 10px;
}

form input, form select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    background: #0073aa;
    color: white;
    padding: 10px;
    border: none;
    border-radius: 5px;
    margin-top: 10px;
    cursor: pointer;
}

button:hover {
    background: #005177;
}

#estimation-result {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
}