body {
    font-family: sans-serif;
    background: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    flex-direction: column;
}
#login-container, #chat-container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    width: 300px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input {
    width: 100%;
    padding: 8px;
    margin: 5px 0;
}
#chat-box {
    height: 200px;
    overflow-y: auto;
    border: 1px solid #ccc;
    margin-bottom: 10px;
    padding: 5px;
    background: #fafafa;
}