Use media queries to show and hide Blocks

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Hi all, do you know if it is possible to show or hide (or replace) a Block, based on the size of viewport in a responsive layout.

reason for this, the great POP MENU add on... when re-sized, the tabs are getting squish... i would need to completely replace the block when it gets smaller for mobile for instance.

or of course use the MQ to change the css styles.

thanks for helping me.

y.

ive