Minor improvement in stylesheet

Signed-off-by: Aniket Pant <me@aniketpant.com>
HTML5 tags implemented.
More scope of improvement. Would like to leave them for the next redesign.

Signed-off-by: Aniket Pant <me@aniketpant.com>
[New Post] My Toolshed

Signed-off-by: Aniket Pant <me@aniketpant.com>