fix(sizes): reduce the xs,sm,md sizes for better handling of the smaller resolutions
fix(sizes): reduce the xs,sm,md sizes for better handling of the smaller resolutions

As those styles will mainly be used in iframe, the potential screen
size can be very small.

Change-Id: I22bf77a46835b30a210801124fe4f84bdccd459c

HumanBrainProject/hbp-collaboratory-theme,HumanBrainProject/hbp-collaboratory-theme,HumanBrainProject/hbp-collaboratory-theme,HumanBrainProject/hbp-collaboratory-theme