CSS: fixed to bottom and centered

Question

I need my footer to be fixed to the bottom of the page and to center it. The contents of the footer may change at all time so I can\'t just center it via margin-left: xxpx;

Answer 1

revised code by Daniel Kanis:

just change the following lines in CSS

.problem {text-align:center}
.enclose {position:fixed;bottom:0px;width:100%;}

and in html:

Your footer text here.