Bomberman,
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<title>Практика Javascript</title>
<style type="text/css">
.modal{
display: none;
position: fixed;
z-index: 1;
left: 0;
top:0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgba(0,0,0,0.8);
}
.modalContent{
background-color: #fefefe;
margin: 15% auto;
padding: 20px;
border:1px solid #888;
width: 80%;
color: black;
text-align: center;
}
.close{
color:#aaa;
float: right;
font-size: 28px;
font-weight: bold;
}
</style>
</head>
<body>
<div id ="lesson_6" class="lessons">
<button id="modalw">Open Modal</button>
<div id="myModal" class="modal">
<div class="modalContent">
<span class="close">×</span>
<p>Modal window</p>
</div>
</div>
</div>
<script>
var modal = document.getElementById("myModal");
btn = document.getElementById('modalw');
span = document.getElementsByClassName("close")[0];
btn.onclick = function () {
modal.style.display = "block";
}
span.onclick = function () {
modal.style.display = "none";
}
window.onclick = function (event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
</script>
</body>
</html>