Changed the url of the stylesheet to be relative.
Moved the two script tags below the body tag. This is standard so that if the JS is broken on the page, it doesn't halt the loading of the page. Also moved the link below the title tag because it is the standard location for it. These changes shouldn't affect how the thing works.
Changed the input tags to be button tags. Buttons have more expected behavior when compared to input type="button". Also, I removed the form tag because it isn't necessary if we aren't going to submit the form. If we are just doing onclick, then no form tag is necessary.