[ticket/232] Use class for clear both <br>

B3P-232
[ticket/232] Add missing margin-right to #viewpoll ID

B3P-232
[ticket/232] Get rid of useless padding and margins in mobile view

B3P-232
[ticket/232] Correctly align right column under left column in mobile view

Javascript code will make sure that the right column is nicely aligned right
below the left column if the screen width is not enough for 3 columns.

B3P-232
Merge pull request #236 from marc1706/ticket/232

[ticket/232] Improve look of responsive portal