ie8 is not support nth-child(n) and last-chilad psedo class. i create sass psedo class mixin.

psedo-class

@mixin psedo-class($attr, $prop, $elem, $n:2) {
    $elems: '';
    @for $i from 1 through $n {
        $elems: #{$elems} + #{$elem};
        @if $i == $n {
            .lt-ie9 &:first-child #{$elems} {
                #{$attr}: #{$prop};
            }
        }
    }
}