Scrolling down on a Mobile Phone

Scrolling down on a Mobile Phone

http://54.200.76.33:8080/
I've got this working on desktop browsers.If you scroll down, you'll see a
search bar shows up at the bottom of the screen and becomes fixed to the
bottom.
If you look at this on a mobile phone, when you scroll down, the bar
doesn't immediately stick to the bottom. It'll wait until the user stops
scrolling, and then it becomes fixed to the bottom.
Is there any way to fix this? Thanks.