Ionic2 psd->scss->ionic2app,how~?

Ionic2 how to cut Photoshop files into HTML? How to make the production of Web adaptive screen?
For example, PSD design I was 1280px*720px, I figure, is to use PX as a unit, or something else? Rem/em/%/vw/vh?
Feel no standard,
In the ionic1, I can set html.font-size, and REM slicing, but in ionic2, html.font-size is set, the page is all is change the, I must to components that each may be used to set.
Do not know where you can see the psd->ionic2 tutorial.

For example, this design, using PX as a unit to mark, if I want to make a ionic2 adaptive screen page, how should I make?