body {
    margin: 20px;
}
.container {
    max-width: 600px;
    margin: auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 10px;
    background-color: #f9f9f9;
}
.input-group {
    margin-bottom: 15px;
}
.input-group label {
    display: block;
    margin-bottom: 5px;
}
.input-group input, .input-group select {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}
.result {
    margin-top: 20px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #e9e9e9;
}
#loading {
    display: none;
    color: blue;
}