header.html

<link rel="shortcut icon" href="favicon/favicon.ico">
<link rel="icon" sizes="16x16 32x32 64x64" href="favicon/favicon.ico">
<link rel="icon" type="image/png" sizes="196x196" href="favicon/favicon-192.png">
<link rel="icon" type="image/png" sizes="160x160" href="favicon/favicon-160.png">
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<link rel="apple-touch-icon" href="favicon/favicon-57.png">
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<meta name="msapplication-TileColor" content="#FFFFFF">
<meta name="msapplication-TileImage" content="favicon/favicon-144.png">
<meta name="msapplication-config" content="favicon/browserconfig.xml">

<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">

<script>
  $( function() {
  $( ".accordion" ).accordion({
      heightStyle: "content",
      active: false,
      collapsible: true
    });
  } );
</script>