Centering in CSS is a pain in the ass. There seems to be a gazillion ways to do it, depending on a variety of factors. This consolidates them and gives you the code you need for each situation.
http://howtocenterincss.com/ <div> </div> </div> </div> <p> </p>
http://www.pythoncentral.io/understanding-python-sqlalchemy-session
https://software.intel.com/en-us/blogs/2014/12/26/new-optimizations-for-x86-in-upcoming-gcc-50-32bit-pic-mode
https://sploitfun.wordpress.com/2015/02/10/understanding-glibc-malloc/
https://github.com/0xAX/linux-insides/blob/master/Booting/linux-bootstrap-1.md