Nicely written Uyioghosasere Daniel Obasuyi, also I like the way you implemented the curved background.
Here are some reviews on your task:
.header child selectors: img, h1, p selectors. Doing this makes the webpage overflow on a smaller viewport.
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So I suggest you make the img width 100% then on the h1 and p use a max-width instead.There're lots of other sections that you could improve on but for now, I'll stop here.