at_rule_placement.scss

%tcell {
    display: table-cell;
    vertical-align: middle;
}
@mixin pseudo-triangle {
    content: '';
    display: block;
    width: 0;
    height: 0;
    position: absolute;
    border: solid transparent;
}
.linkster {
    @extend %tcell;
    @include pseudo-triangle;
    position: static;
    vertical-align: top;
}