body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
button {
    background: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px 5px;
}
button:hover {
    background: #0056b3;
}
#content {
    margin-top: 20px;
    padding: 15px;
    background: #e9ecef;
    border-radius: 5px;
    min-height: 50px;
}
.loading {
    opacity: 0.6;
}