hello, thank you so much for enjoying my code! (and apologies for the late reply, i missed this somehow the first time...)

for the first question, may i ask what phone model and browser you're using? i suspect it may be due to having an older phone or browser, as i checked and it shows fine on my own phone and others... (rubs chin) if this is the case the only solution i could think of would be to upgrade one's web browser, but that aside it should show up fine on mobile to other users!

for the second, you can change the no-repeat bottom center after the image url to no-repeat center center, and then you can further adjust it by changing the background-size property from cover to other sizes in either pixels or percentages i.e. 1500px or 110%! if you'd like a perfect fit of the entire image in that space, though, it's a tad finicky because the image isn't just trying to fit into the left space, but the entire post card (like so); in that case you might want to add a transparent blank space on the right of the image's canvas to fidget with it...

hope that helps! o/