/// Calculate width for a magic column
///
/// @author [@esr360](http://twitter.com/esr360)
/// @access public
/// @group Kayzen-GS
/// @param {number} $columns - the maxinum number of columns being used
/// @return {number} - width of column
@function kgs-magic-width($columns: $columns) {
    @return (100 / $columns) - ( ( ( (100 / (100 / $columns) ) - 1) * kgs-option('gutter') ) / $columns );
}