Fixed typo in searchbox.css

Fixes #86.
Merge pull request #88 from kfa/fix_searchbox_css_typo

Fixed typo in searchbox.css
Update ImageButtons to use new shapes.
Add styling for platforms and image buttons.
Merge pull request #89 from dankurka/update_buttons

Update ImageButtons to use new shapes.
Merge pull request #90 from dankurka/imagebutton_styling_platforms

Add styling for platforms and image buttons.
Addressed comments
Merge pull request #91 from dankurka/imagebutton_styling_platforms

Addressed comments