Pop-ups can be used to display a message to the user or to notify an event. In this code, we also have a pop-up. This pop-up is simple and is displayed in the middle of the screen. There is a green button at the bottom of the pop-up. Clicking this button will close the pop-up. This green button is full width and its title is white.

<!-- This script got from www.devanswer.com -->
<div class="popup">
  <div class="content">
    This is some important information showing in a popup sign.
  <div class="buttons">
    <button onclick="hide()">Okay</button>
<button onclick="toggle()">Show!</button><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com">Developers Answer</a></div>

body {
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  font-size: 15px;
  background-color: #ccc;
.popup {
  background-color: #fff;
  width: 0px;
  height: 0px;
  overflow: hidden;
  transition: width 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55), height 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55), top 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  position: absolute;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  top: 30%;
  box-shadow: 0px 1px 2px #1a2308;
  border-radius: 7px;
  display: flex;
  flex-direction: column;
.popup .content {
  padding: 10px;
  color: #555;
  text-align: center;
  margin-top: auto;
.popup .buttons {
  margin-top: auto;
.popup .buttons button {
  background-color: #96CA2D;
  border: 1px solid #a2d43d;
  width: 100%;
  padding-top: 7px;
  padding-bottom: 7px;
  color: #fff;
  cursor: pointer;
  text-transform: uppercase;
  font-weight: bold;
  font-size: 16px;
.popup.show {
  width: 200px;
  height: 130px;
  top: 10%;
function toggle () {
  let element = document.getElementsByClassName('popup')[0]
  let classes = element.className;
  if (classes.indexOf('show') !== -1) {
    element.className = element.className.replace('show', '').replace(' ', '')
  } else {
    element.className += ' show'
function hide() {