body {
    font-family: sans-serif;
    background-color: #f0f0f0;
}

.login-container {
    width: 300px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.chat-container {
    width: 500px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.messages {
    height: 300px;
    overflow-y: scroll;
    border: 1px solid #ccc;
    padding: 10px;
}

.message {
    margin-bottom: 10px;
    padding: 5px;
    border-radius: 5px;
    background-color: #eee;
}

.username {
    font-weight: bold;
    margin-right: 5px;
}

.timestamp {
    font-size: 0.8em;
    color: #888;
}

form {
    margin-top: 20px;
}

input[type="text"] {
    width: 70%;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    width: 25%;
    padding: 5px;
    border: none;
    background-color: #4CAF50;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}