Thats more of an issue with that website. Yes having the bar there means the website has less pixels to display things with. On the left image there's a scroll bar, scroll down a little and you'll see the buttons that are on the right image. This is just "having a bar at the bottom of the screen means you have less screen". Most apps will adjust to your screen size, some add a scroll bar.
To sum up, seems normal. Having the bottom bar means apps and websites have less screen to show you things with, meaning they might add a scroll bar or squish things closer together.