body {
    font-family: sans-serif;
    margin: 20px;
    background-color: #f4f4f4;
    color: #333;
}
.container {
    max-width: 600px;
    margin: 30px auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
h1, h2 {
    color: #007bff;
    text-align: center;
}
form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
input[type="text"],
input[type="password"] {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
button {
    background-color: #007bff;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
button:hover {
    background-color: #0056b3;
}
.message-area {
    border: 1px solid #eee;
    padding: 10px;
    height: 300px;
    overflow-y: scroll;
    margin-bottom: 10px;
    background-color: #fdfdfd;
    border-radius: 4px;
}
.message {
    padding: 5px 0;
    border-bottom: 1px dotted #eee;
}
.message:last-child {
    border-bottom: none;
}
a {
    color: #007bff;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
.nav-links {
    text-align: center;
    margin-top: 20px;
}
.nav-links a {
    margin: 0 10px;
}