To style every element that is not the specified element, use the CSS :not(selector) selector.
Example
You can try to run the following code to implement the :not selector:
<!DOCTYPE html>
<html>
<head>
<style>
p {
color: red;
}
:not(p) {
color: blue;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
</body>
</html>