Recent websites usually use the ability to communicate with the website support department. This process is done in a chat. In this code, this chat window is displayed with the help of pop-up. At first, only a gray button is displayed on which the phrase chat is written. Clicking on it will display a window in the corner of the website with a box for writing content and a button for sending messages. There is also a button to close this window.


HTML
<!-- This script got from www.devanswer.com  -->
<div class="container">
  <h2>
    Popup Chat Window
  </h2>
  <p>
    Click on the button at the bottom of this page to open the chat form.
  </p>
  <button class="open-button" onclick="openForm()">Chat</button>
  <div class="chat-popup" id="myForm">
    <form action="" class="form-container">
      <h1>Chat</h1>
      <label for="msg"><b>Message</b></label>
      <textarea placeholder="Type message.." name="msg" required></textarea>
      <button class="btn" onclick="DefaultForm(this)">Send</button>
      <button type="button" class="btn cancel" onclick="closeForm()">Close</button>
    </form>
  </div>
</div><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com ">Developers Answer</a></div>
                        

CSS
body {
  font-family: Arial, Helvetica, sans-serif;
}
* {
  box-sizing: border-box;
}
h2 {
  font-size: 24px;
}
.container {
  font-size: 14px;
  padding: 15px;
  width: 90%;
  margin: 0 auto;
}
.open-button {
  background-color: #555;
  color: white;
  padding: 16px 20px;
  border: none;
  cursor: pointer;
  opacity: 0.8;
  position: fixed;
  bottom: 23px;
  right: 28px;
  width: 280px;
}
.chat-popup {
  display: none;
  position: fixed;
  bottom: 0;
  right: 15px;
  border: 3px solid #f1f1f1;
  z-index: 9;
}
.form-container {
  max-width: 300px;
  padding: 10px;
  background-color: white;
}
.form-container textarea {
  width: 100%;
  padding: 15px;
  margin: 5px 0 22px 0;
  border: none;
  background: #f1f1f1;
  resize: none;
  min-height: 200px;
}
.form-container textarea:focus {
  background-color: #ddd;
  outline: none;
}
.form-container .btn {
  background-color: #04AA6D;
  color: white;
  padding: 16px 20px;
  border: none;
  cursor: pointer;
  width: 100%;
  margin-bottom:10px;
  opacity: 0.8;
}
.form-container .cancel {
  background-color: red;
}
.form-container .btn:hover, .open-button:hover {
  opacity: 1;
}
Javascript
function DefaultForm(e) {
    event.preventDefault();
}
function openForm() {
  document.getElementById("myForm").style.display = "block";
}
function closeForm() {
  document.getElementById("myForm").style.display = "none";
}