body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

#chat-container {
    width: 400px;
    height: 600px;
    border: 1px solid #ccc;
    border-radius: 5px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 10px;
}

#message-form {
    display: flex;
    padding: 10px;
}

#message-input {
    flex-grow: 1;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 3px;
}

button {
    margin-left: 5px;
    padding: 5px 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}