<!DOCTYPE html>

<head>
  <title>Impact Map</title>
  <!-- Load CSS for this page -->
  <link rel="stylesheet" href="style.css"/>
  <!-- Load CSS for Leaflet -->
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.1.0/dist/leaflet.css" integrity="sha512-wcw6ts8Anuw10Mzh9Ytw4pylW8+NAD4ch3lqm9lzAsTxg0GFeJgoAtxuCLREZSC5lUXdVyo/7yfsqFjQ4S+aKw==" crossorigin="" />
  <!-- Load JS for Leaflet. Make sure you put this AFTER Leaflet's CSS -->
  <script src="https://unpkg.com/leaflet@1.1.0/dist/leaflet.js" integrity="sha512-mNqn2Wg7tSToJhvHcqfzLMU6J4mkOImSPTxVZAdo+lcPlk+GhZmYgACEe0x35K7YzW1zJ7XyJV/TT1MrdXvMcA==" crossorigin=""></script>
</head>

<body>
  <div id="mapid"></div>
</body>
<script src="client.js"></script>
</html>

<!DOCTYPE html>

<head>
  <title>Impact Map</title>
  <!-- Load CSS for this page -->
  <link rel="stylesheet" href="style.css"/>
  <!-- Load CSS for Leaflet -->
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.1.0/dist/leaflet.css" integrity="sha512-wcw6ts8Anuw10Mzh9Ytw4pylW8+NAD4ch3lqm9lzAsTxg0GFeJgoAtxuCLREZSC5lUXdVyo/7yfsqFjQ4S+aKw==" crossorigin="" />
  <!-- Load JS for Leaflet. Make sure you put this AFTER Leaflet's CSS -->
  <script src="https://unpkg.com/leaflet@1.1.0/dist/leaflet.js" integrity="sha512-mNqn2Wg7tSToJhvHcqfzLMU6J4mkOImSPTxVZAdo+lcPlk+GhZmYgACEe0x35K7YzW1zJ7XyJV/TT1MrdXvMcA==" crossorigin=""></script>
</head>

<body>
  <div id="mapid"></div
  <script src="client.js">
</body>
</html>

Move client.js reference to body and remove unneeded </script>
Move client.js reference to body and remove unneeded </script>
