javascript - How to fix position an element but keep the height relative to browser window? -

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you noticed web sites have feedback feature created http://uservoice.com. display's badge on left or right of screen.

but, how badge positioned? looks position depends on height of browser....

can me how create sort of badge this, functionality redirect me other url?

tnx in adv!

it uses position: fixed on a tag. using top: 45% "move" window height.


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