Program shows error while executing

is there anything wrong with the link element in the program below, its is constantly showing error.
from what iam seeing its right but then why its is showing error

<!DOCTYPE html>
<html>
<head>
  <title>Registration Form</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
</body>
</html>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.115 Safari/537.36 OPR/88.0.4412.65

Challenge: Step 4

Link to the challenge:

Link element is self closing tag. So you should close this tag.

eg. <link />

" / " this is optional ?