Fixed the bug which was preventing border to appear after clicking arrow in examples.
Merge branch 'master' of https://github.com/sahilshekhawat/sympy_gamma
added random example to button
made 'random example' button clickable in Firefox.
Styled the anchor tag to look like button
made 'clear-recent' button of same width as 'random-example'
Fixed the issue of cross browser styling of button and anchor tag
Fixed firefox issue with random example button
Merge pull request #47 from sahilshekhawat/firefox_clickable

Made random example clickable in Firefox.