Getting blank space while using HTML code

Hi Team

I am getting blank space in the beginning of the page when i use complete HTML code in the page. Please find the link http://www.tuteweb.com/html/1/ where you can see a white space in the beginning of the page. Please find the attached SS for reference. Please note this happens only when i use HTML editor and not the visual editor. Please let me know how to solve this problem.

Note: This happens with all the pages tested using HTML editor.