2 issues.....

1st, the height of one of my pages is 10368px. I keep trying to increase that size a lot more - maybe about half that. I've tried something like 20000px, and I get theis message, "The page height you entered was invalid. It must pe a positive, non-zero measurement, maximum for page and margins is about 9ft (2.75M), minimum 4 pixels.". How do I increase the height of my page? Let say I want to double its current size. How do I do that?

2nd, where could I find and successfully integrate animated and designer buttons into the program? I'm looking to improve the look of my website. I've already checked the buttons it provides, but I'm looking for something better.