Einbinden eines externen Stylesheets

<!doctype html> <html lang="de"> <head> <link rel="stylesheet" href="stylesheet.css">

<html lang="de" >
<head>
  <meta charset="UTF-8">
  <title>kr@nner.net</title>
  <link rel="stylesheet" href="./style.css">

</head>
<body>

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