<!doctype html>
<html>
<head>
  <title>Partyhack</title>
  <script src="jquery.min.js"></script>
  <script src="partyhack.js"></script>
</head>
<body>
</body>
</html>

<!doctype html>
<html>
<head>
  <title>Partyhack</title>
  
  <link rel="stylesheet" type="text/css" href="styles.css">
  <script src="jquery.min.js"></script>
  <script src="partyhack.js"></script>
</head>
<body>
</body>
</html>

Add link to styles document.
Add link to styles document.