@pending(@line, @back, @sep: 80%) {
    @hep: @sep / 2;
    @aep: 50% + @hep;
    background-image:
        linear-gradient(53.13deg,
            @back, @hep,
            @line, @hep, @line, 50%,
            @back, 50%, @back, @aep,
            @line, @aep, @line );
    background-size: 15px 20px;
    background-repeat: repeat;
}