<!DOCTYPE html>
<html>
<head>
<script src = "https://code.jquery.com/jquery-1.8.3.js"></script>
<script>
$().ready(function(){
$('section div').css('color','green');
});
</script>
</head>
<body>
<section>
<div id = "div1">
Div 1
</div>
<div id = "div2">
Div 2
</div>
<div id = "div3">
Div 3
</div>
</section>
<div>
Neightbour
</div>
</body>
</html>