apply ccs to the whole code example
Example: how to like css to html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Title</title>
<link rel="stylesheet" type="text/css" href="path of your file" />
</head>
</html><!DOCTYPE html>
<html lang="en">
<head>
<title>Title</title>
<link rel="stylesheet" type="text/css" href="path of your file" />
</head>
</html>