customSvgIcon css class bug fixed for rtl layouts

in RTL layout, selecting colors and font thickness parts in whiteboard, will not appear correctly when they expand; one item will be thrown out of the container (overflow).
the following images demonstrate the problems.
adding some additional style to customSvgIcon class in css will fix the bug.

http://up.maralhost.com/do.php?img=359
http://up.maralhost.com/do.php?img=364