Steemit Cover Image - Still figuring out

I'm still figuring it out how to design without being corp or auto position by the default of css in this website settings.
All we can do is upload and it just do the automated corp for us and positioning for us .
If you using a web browser, u'll have to not click maximize to make the Cover image is the right size.

but still the sizing is not that accurate. If you open and see the source code by doing Right click to the banner and click Inspect, it will promp a side right bar and you can see the size of the banner

As you can see here, the size are 2048 by 512. if you thinking this is from the original size of this banner you are wrong. This original banner size is 1920x1080

i also tried to design in photoshop but the result is also not that great. when im using that sizing. at the end i tried 2048x312 instead of 2048x512 and you can see the result by visiting my profile. its way out and cropped by default config in this website which is auto css resizing if im not mistaken.

im still finding a way to make my banner to perfectly fit.