CSS

css odd even child

tr:nth-child(even) {background: #CCC}
tr:nth-child(odd) {background: #FFF}

select even child css

li:nth-child(even) { /* Selects only even elements */
    color: green;   
}

select odd child css

li:nth-child(odd) { /* Selects only odd elements */
    color: green;   
}