.green { background-color : lime ! important; }
ul > li:not(:nth-child(odd)) { background-color : red }
ol > li:not(:nth-child(even)) { background-color : red }
table.t1 tr:not(:nth-child(-n+4)) { background-color : red }
table.t2 td:not(:nth-child(3n+1)) { background-color : red }
table.t1 td, table.t2 td { border : thin black solid }