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<!DOCTYPE html>
<html>
<head>
<style>
p:only-of-type {
background: #ff0000;
}
</style>
</head>
<body>

<div><p>This is a paragraph.</p></div>

<div><p>This is a paragraph.</p><p>This is a paragraph.</p></div>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
<style> 
p:only-of-type {
    background: #ff0000;
}
</style>
</head>
<body>

<div><p>This is a paragraph.</p></div>

<div><p>This is a paragraph.</p><p>This is a paragraph.</p></div>

</body>
</html>