Try adding the following to your css:
Replace 900px with the width of your Animate composition.
Another option is to build the site with Muse, which lets you center items in a page simply by dragging it into position using guidelines.
It works every time (so far).
I tried out this method but whenever i open edge animate, it forcifully makes the stage alignment set to default..
Really.. I used it and it worked great. Did you add it to compositionReady ?
I just found this posting. I did add the code (adjust the width to mine) to the compositionReady.
It is not working. What am I doing wrong? How would I center my page in browser?