How to used ionic content middle of screen in ionic-model?

i used to ionic content middle of ionic-model screen but problem was there ionic-content top height different for any devices android ios ipad etc…
@mhartington
@brandyshea
solve my issue …thanks.
here is my code

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haider ali

haider ali

`![image](upload://iE8uVqdcy7kc5v92o4hFJMGTCEr.png)