This gives the page a balance. Aligning right is good for comparisons from each side of the page, or to mark text around a graphic. The center and full justification should never be used. The reader is distracted from to many spaces, and from having to search to find the start of the next line. Readability is important in designing your page.
White space is preferable over a bunch of garbled content.
The H1-H6 tags leave to much space around the heading. The amount you change the font size to, also will show up better in any browser viewing the page. If you wish some text to be smaller, just change the amount to a negative number. Lastly, every page within a site should be represented as another page of the site. Using the same logo, background color, etc., let's your visitors know that they are still on a page that is part of your site.