Recommended container size

Hi folks,

I was wondering what would be the general recommendation for container size of a website, i see some that use 960x or 1140px as most standard desktop sizes are 1200px shouldn’t 1200px be selected in our CSS?

100%/100vw would be the ideal container size, otherwise it’s just a guess. Why do you assume the viewport size will be the same as the desktop size?

well i am not understanding how one determines the container size in pixels i see some developers using different pixels size for their container with a max-width