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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
<style>
#outer {
  padding-bottom: 15px;
}
#inner {
  border: 1px solid black;
}
#inner.big {
  border-width: 3px;
}
</style>
  
<div id="outer">
  <div id="inner"></div>
</div>
<script>
  
var outer = document.getElementById('outer');
var inner = document.getElementById('inner');
outer.addEventListener('mouseenter', function() {
  inner.className = 'big';
});
outer.addEventListener('mouseleave', function() {
  inner.className = '';
});
</script>
  
</body>
</html>
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anonymouspro
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