I'm using Bootstrap for the first time and trying to implement it with an existing site of mine. I am using the default fluid container widths which I have read to be 724px and 1170px wide depending on your viewport. Maybe it sounds silly, but I'm just trying to grasp the concept here. Is 1170px the widest the site will ever show up, no matter what size screen the site is being shown on? Is it best to make my my banner image 1170px wide, or should it be larger?