Here i’m going to list some useful browser specific CSS selectors, known as browser specific hacks;

IE 6 and below: * html {}

IE 7 and below: *:first-child+html {} * html {}

IE 7 only : *:first-child+html {}

IE 7 and modern browsers only: html>body {}

Modern browsers but NOT IE7: html>/**/body {}

Opera 9 and below: html:first-child {}

Safari: html[xmlns*=""] body:last-child {}

Check this tutoaial to learn how to use CSS selectors »