Fixed what-to-build section jumping around page after clicking HIT ME

Now the intro fades out, and when finished, the what-to-build section fades in
Removed white background from close button
Made all buttons have consistent borders
Fixed link to Tevko site

It was linking to / so would only link correctly when hosted on the tevko site itself
Added missing </div> tag

<div class="after"> had not been closed
Merge pull request #1 from jammaloo/master

Various visual fixes