Mobile first design using Flutter

I decided to do this challenge to improve my state management skills with Flutter. I was able to learn a lot about solutions to state management in Flutter and the one that I like using the most is Flutter provider. With that said, I do still have a few questions:

1. What are methods to accomplish responsive design in Flutter? Currently, I use a provider to determine the root size of elements in the UI based on the device width. Is this an expensive method or is it good practice?
2. How to work with SVG images in Flutter? From what I read, the current solution is to use flutter_svg but when I tried importing the images the background color was broken. My workaround for this was to convert all the svg's to png's and importing the png's instead, but I was hoping that I could work with svg's directly.

Any and all feedback would be greatly appreciated! Really enjoy learning things like these. Cheers🎉