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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<style type="text/css">
.ok {
background : #0f0;
height : 40px;
width : 40px;
}
.error {
opacity : .001;
height : 100%;
width : 100%;
}
.error > span {
background : #f00;
content : "";
display : block;
height : 100%;
width : 100%;
}
</style>
</head>
<body>
<div class="ok">
<div class="error"><span></span></div>
</div>
</body>
</html>