Website layout “breaks apart” when zooming in or out in browsers + a few other basic css questions

Question

I\'m pretty much as new to CSS as it gets and what I\'m trying to do right now is just design a very simple/basic splash or landing page for a small business.

Here i

Answer 1

not sure for your points 1 & 2, but as for 3 what i've come to use is the following have the div i want to center and then use width : some-percentage; margin-left : 100-(some_percentage)*0.5 ;, where some percentage is the width I want to use.