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<!DOCTYPE html>
<html>
<head>
<style>
p:empty {
   width: 100px;
   height: 20px;
   background: #ff0000;
}
</style>
</head>
<body>

<p></p>
<p>A paragraph.</p>
<p>Another paragraph.</p>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
<style> 
p:empty {
    width: 100px;
    height: 20px;
    background: #ff0000;
}
</style>
</head>
<body>

<p></p>
<p>A paragraph.</p>
<p>Another paragraph.</p>

</body>
</html>