Jquery Id Selector

<!DOCTYPE html>
<html>
  <head>
    <script src="../../ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  </head>
  <body>
    <h1 id="myh1"> this heading color blue and background red </h1>
    <script>
      $("document").ready(function(){
         var h1 = $("#myh1");
        h1.css({"color":"blue","background":"red"});
      })
    </script>
  </body>

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</html>