#chat {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    border: 1px solid #ccc;
    padding: 10px;
    height: 400px;
    display: flex;
    flex-direction: column;
}

#messages {
    list-style-type: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex: 1;
}

#messages li {
    padding: 5px 10px;
    margin-bottom: 5px;
    border-radius: 5px;
}

#messages li:nth-child(odd) {
    background-color: #f1f1f1;
}

#send-message {
    display: flex;
}

#chat-txt {
    flex: 1;
    padding: 5px;
}

#chat-btn {
    padding: 5px 10px;
}