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<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0;
}
#main {
width: 500px;
height: 500px;
opacity: 0.999;
background: lime;
border: 1px solid black;
}
.censor {
position: absolute;
width: 1px;
height: 1px;
background: cyan;
}
</style>
</head>
<body>
<div id="main"></div>
<div class="censor" style="left:0; top:0;"></div>
<div class="censor" style="left:501px; top:0;"></div>
<div class="censor" style="left:0; top:101px;"></div>
<div class="censor" style="left:501px; top:101px;"></div>
</body>
</html>