responsive landing page

I used the border-radius properties to render the curved background. I think the best way to achieve it would have been using svg, but since it wasn't provided I tried of thinking of a different way. I also realized only at the end that all of the page had a max-width of 1220 px, so I added an additional container query to adjust the header for really big screen. It definitely was my oversight, I'll probabily check it first thing the next time :).