<!doctype html>
<html>
<head>
<script src="js/jquery/1.11.3/jquery.min.js"></script>
<style>
div {
width: 50px;
height: 50px;
margin: 13px;
float: left;
}
</style></head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
$("div").css("border", "3px solid red");
</script></body>
</html>