How to split messages into lines?

Question

JavaScript

Good afternoon. I found an example of a chat on sockets on the net, the chat works, but if the message is too long and goes beyond the chat, it is cut off, tell me what needs to be fixed so that long messages are broken into lines?

// /project_dir/index.html
$(document).ready(function () {
        var socket = io.connect('http://localhost:8008');
        var name = 'Пётр_' + (Math.round(Math.random() * 10000));
        var messages = $("#messages");
        var message_txt = $("#message_text")
        $('.chat .nick').text(name);
 
        function msg(nick, message) {
            var m = '<div class="msg">' +
                    '<span class="user">' + safe(nick) + ':</span> '
                    + safe(message) +
                    '</div>';
            messages
                    .append(m)
                    .scrollTop(messages[0].scrollHeight);
        }
 
        function msg_system(message) {
            var m = '<div class="msg system">' + safe(message) + '</div>';
            messages
                    .append(m)
                    .scrollTop(messages[0].scrollHeight);
        }
 
        socket.on('connecting', function () {
            msg_system('Соединение...');
        });
 
        socket.on('connect', function () {
            msg_system('Соединение установлено!');
        });
 
        socket.on('message', function (data) {
            msg(data.name, data.message);
            message_txt.focus();
        });
 
        $("#message_btn").click(function () {
            var text = $("#message_text").val();
            if (text.length <= 0)
                return;
            message_txt.val("");
            socket.emit("message", {message: text, name: name});
        });
 
        function safe(str) {
            return str.replace(/&/g, '&amp;')
               .replace(/</g, '&lt;')
               .replace(/>/g, '&gt;');
        }
    });

// /project_dir/main.css
.demo {
    width: 600px;
    margin: 20px auto;
    padding: 10px;
    color: #4F6B72;
    font-family: "PT Sans", Verdana, Arial, sans-serif;
    font-size: 13px;
}
 
.chat .messages{
    height: 300px;
    border: 1px solid #d4d4d4;
    overflow-y: scroll;
    overflow-x: hidden;
    padding: 5px;
}
 
.chat .messages .user{
    color: #B22222;
}
 
.chat .message{
    width: 70%;
}
 
.chat .panel{
    margin-top: 8px;
}
 
#message_text{
    width: 60%;
    display: inline-block;
    margin-left: 8px;
}

Answer 1

As an option: you need to see what happens at the output and play tricks with styles (via chromeDevTools), so as not to be smart with transfers.
https://webref.ru/css/word-break