body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(45deg, black, red);
    background-size: 400% 400%;
    animation: gradientAnimation 15s ease infinite;
    font-family: Arial, sans-serif;
}

@keyframes gradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

#chat_container {
    width: 80%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

#chat_window {
    height: 400px;
    overflow-y: auto;
    margin-bottom: 20px;
    background: rgba(0, 0, 0, 0.1);
    padding: 10px;
    border-radius: 10px;
}

#messages {
    list-style: none;
    padding: 0;
}

#messages div {
    margin-bottom: 10px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    color: white;
}

#message_form {
    display: flex;
}

#message_input {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 5px;
    margin-right: 10px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

#message_form button {
    padding: 10px;
    border: none;
    border-radius: 5px;
    background: red;
    color: white;
    cursor: pointer;
    transition: background 0.3s ease;
}

#message_form button:hover {
    background: darkred;
}