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/* 1st child */

:nth-child(1){background: red;}

/* or */

:first-child(){background: red;}



/* 1st and 3rd child elements */

:nth-child(3n+1){background:orange;}



/* 2nd and 4th child elements */

:nth-child(4n+2){background:yellow;}



/* 5th child */

:nth-child(5){background:blue;}



/* 1st and 6th child elements */

:nth-child(5n+1){background:orange;}



/* last child */

:last-child(){background: green;}



/* odd children */

:nth-child(odd) {background: #ff0000;}



/* even children */

:nth-child(even) {background: #0000ff;}