Can you figure out?

Everytime I uses the Firefox Mozilla in doing my blog, it appears like one below. Eventhough, I already change the font, font size and font color, it just appear like this:

I tried shifting to Windows Internet Explorer and it looks like one below. It follows the way I wanted it to appear. Can you figure out why?

Last night, my bro who's using Mozilla Firefox said my blog appears OK in his page.How about in yours? Maybe my browser is not working well in our computer...what do you think?