// Rem output with px fallback @mixin font-size($sizeValue: 1) { font-size: ($sizeValue * 16) * 1px; font-size: $sizeValue * 1rem; } // Center block @mixin center-block { display: block; margin-left: auto; margin-right: auto; } // Column width with margin @mixin column-width($numberColumns: 3) { width: map-get($columns, $numberColumns) - ( ( $columns__margin * ( $numberColumns - 1 ) ) / $numberColumns ); }