Cardless

            
.cardless(@columns, @margin) {
    float: left;
    margin-right: @margin;
    margin-bottom: @margin;
    width: ~"calc((100% - (@{columns} - 1) * @{margin}) / @{columns})";

    &:nth-of-type(@{columns}n + @{columns}) {
        margin-right: 0;
    }
}