HTML CSS Flexbox SASS

I didn't find problems in general But What I would like to do in this challenge is to make the design as pixel perfect as possible (I am don't have pro). I used Pixel Perfect extension on Chrome but the problem I faced is that the Design Preview is 1440x1056 and the Site on my device is 1200 or less and the height is the height of the screen of the laptop I use which is less than 1056 for sure. How can I compare the Preview Design with my design if the preview layer doesn't land properly on my Solution. Sorry for the long talk 😥 but I am very eager and curios to make the challenge Pixel Perfect.