I never see Computer Modern font, the one shipped as default for LaTeX type setting system, on any webpage.
How to change the CSS so that font will actually wor
you cannot, up until CSS 2.1 you can only use the fonts that are ACTUALLY installed on the client's computer. In CSS 3 there are some ways to embed fonts in your webpage but those ways are not greatly supported by browsers yet. Have a look here: http://home.tiscali.nl/developerscorner/fdc-varia/font-embedding.htm