[Web Previewer] customizing of the preview

Hi, i am trying to use this web previewer on my application and i came across a few problems.

I am using the web previewer to display a pdf page.

I am trying to make the pdf fits the whole screen, or the majority of it, so i set the web block height to "100%" but it looks like that and does not get any bigger.

Is there a way to make it so that it fits whichever screen the user has?

Another problem i was hoping it could be changed is that, this application is to be viewed on a mobile phone and i am hoping if i could use the touch screen capabilities on the device to zoom the view of the pdf without needing to click to zoom button.

Is there any way to implement this?