why does my css move code example

Example 1: html css position

.class{ position: attribute ; }

Example 2: html position div

<!DOCKTYPE html> <!-- Start of coding page -->
<html> <!-- Start of html coding -->
  <head> <!-- Start of head -->
    <title>TITLE<title> <!-- Title -->
    <script>
      //JavaScript
    </script>
    <style>
      /* CSS */
    </style>
  </head> <!-- End of head -->
  <body> <!-- Start of body -->
    <div id='mydiv' style = "position:relative; left:0px; top:100px;">
      Hello! 
      <!-- Use that style tag to positions things, have a play around with it! -->
    </div>
  </body> <!-- End of body -->
<html> <!-- End of html coding -->
<!-- Add this line of code next to your id: 

style = "position:relative; left:0px; top:100px;" 

too let you position divs where you want them, you can even position
them ontop of other divs! -->

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Css Example