refactors index.html and css

with these changes Firefox shows padding on bottom of document
fixes issues from prev coommit 45ee781

partly resolve #146
fixes sliding issue; removes unnecessary comments
one more fix for sliding
one more fix, to resolve issue causing by new positions of elements
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
moves only .scrollbox for better sliding effect
rids off horizontal scrollbar
Merge pull request #149 from vovkkk/gh-pages

with these changes Firefox shows padding on bottom of document