1) I checked your site and don’t see problem with the top header color https://prnt.sc/1wy1w6x
I see that you installed the cache plugin and CND and it could be the reason of your issue because once you make changes of the colors via Theme Options it saves changes in the CSS file. Cache plugin and CDN cache CSS files. So, I would recommend you disable the cache plugin and CDN cache if your site is under development. Or clear cache after changes, clear both: plugin cache, CDN cache and browser cache https://chrome.google.com/webstore/detail/clear-cache/cppjkneekbjaeellbfkmgnhonkkjfpdn
You can log in to CloudFlare account https://aastacademy.com/womenmall/wp-admin/options-general.php?page=cloudflare#/login to clear CDN cache from the WP Dashboard to apply changes
2) I see that you enabled search like in niche demo and I changed the border and it looks ok https://prnt.sc/1wy2xo6 So you want to change also border-radius for your input like we have on the niche demo?
3) Edit min-height of the bottom header and color https://prnt.sc/1wy351c Clear plugin cache, CDN cache and browser cache to apply changes or just temporarily disable them.
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