Hello Falguni —
My header image 1400 x 400, when I loaded it, came with a suggestion to crop. The background image is also 1400 width, but no suggestion to crop. It shrinks by 1/8 togive plain background color on one or two sides, depending if you choose center or not. I would love to see both header and background image line up.
for a peek: https://www.hadow.org
Thanks Robert