diff --git a/scss.scss b/scss.scss
index aa1f82b9..5d4221f7 100644
--- a/scss.scss
+++ b/scss.scss
@@ -6,6 +6,12 @@
 //
 // Licensed under MIT (https://github.com/twbs/rfs/blob/main/LICENSE)
 
+@use "sass:map";
+@use "sass:math";
+@use "sass:meta";
+@use "sass:list";
+@use "sass:string";
+
 // Configuration
 
 // Base value
@@ -30,7 +36,7 @@ $rfs-two-dimensional: false !default;
 // Factor of decrease
 $rfs-factor: 10 !default;
 
-@if type-of($rfs-factor) != number or $rfs-factor <= 1 {
+@if meta.type-of($rfs-factor) != number or $rfs-factor <= 1 {
   @error "`#{$rfs-factor}` is not a valid  $rfs-factor, it must be greater than 1.";
 }
 
@@ -50,7 +56,7 @@ $rfs-safari-iframe-resize-bug-fix: false !default;
 $enable-rfs: true !default;
 
 // Cache $rfs-base-value unit
-$rfs-base-value-unit: unit($rfs-base-value);
+$rfs-base-value-unit: math.unit($rfs-base-value);
 
 @function divide($dividend, $divisor, $precision: 10) {
   $sign: if($dividend > 0 and $divisor > 0 or $dividend < 0 and $divisor < 0, 1, -1);
@@ -80,16 +86,16 @@ $rfs-base-value-unit: unit($rfs-base-value);
     }
   }
   $result: $result * $factor * $sign;
-  $dividend-unit: unit($dividend);
-  $divisor-unit: unit($divisor);
+  $dividend-unit: math.unit($dividend);
+  $divisor-unit: math.unit($divisor);
   $unit-map: (
     "px": 1px,
     "rem": 1rem,
     "em": 1em,
     "%": 1%
   );
-  @if ($dividend-unit != $divisor-unit and map-has-key($unit-map, $dividend-unit)) {
-    $result: $result * map-get($unit-map, $dividend-unit);
+  @if ($dividend-unit != $divisor-unit and map.has-key($unit-map, $dividend-unit)) {
+    $result: $result * map.get($unit-map, $dividend-unit);
   }
   @return $result;
 }
@@ -103,7 +109,7 @@ $rfs-base-value-unit: unit($rfs-base-value);
 }
 
 // Cache $rfs-breakpoint unit to prevent multiple calls
-$rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
+$rfs-breakpoint-unit-cache: math.unit($rfs-breakpoint);
 
 // Remove unit from $rfs-breakpoint for calculations
 @if $rfs-breakpoint-unit-cache == px {
@@ -155,7 +161,9 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
       @content;
     }
   } @else {
-    @content;
+    & {
+      @content;
+    }
   }
 }
 
@@ -190,7 +198,7 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
 // Helper function to get the formatted non-responsive value
 @function rfs-value($values) {
   // Convert to list
-  $values: if(type-of($values) != list, ($values,), $values);
+  $values: if(meta.type-of($values) != list, ($values,), $values);
 
   $val: "";
 
@@ -201,7 +209,7 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
     }
     @else {
       // Cache $value unit
-      $unit: if(type-of($value) == "number", unit($value), false);
+      $unit: if(meta.type-of($value) == "number", math.unit($value), false);
 
       @if $unit == px {
         // Convert to rem if needed
@@ -218,13 +226,13 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
   }
 
   // Remove first space
-  @return unquote(str-slice($val, 2));
+  @return string.unquote(string.slice($val, 2));
 }
 
 // Helper function to get the responsive value calculated by RFS
 @function rfs-fluid-value($values) {
   // Convert to list
-  $values: if(type-of($values) != list, ($values,), $values);
+  $values: if(meta.type-of($values) != list, ($values,), $values);
 
   $val: "";
 
@@ -234,7 +242,7 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
       $val: $val + " 0";
     } @else {
       // Cache $value unit
-      $unit: if(type-of($value) == "number", unit($value), false);
+      $unit: if(meta.type-of($value) == "number", math.unit($value), false);
 
       // If $value isn't a number (like inherit) or $value has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
       @if not $unit or $unit != px and $unit != rem {
@@ -244,15 +252,15 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
         $value: divide($value, $value * 0 + if($unit == px, 1, divide(1, $rfs-rem-value)));
 
         // Only add the media query if the value is greater than the minimum value
-        @if abs($value) <= $rfs-base-value or not $enable-rfs {
+        @if math.abs($value) <= $rfs-base-value or not $enable-rfs {
           $val: $val + " " + if($rfs-unit == rem, #{divide($value, $rfs-rem-value)}rem, #{$value}px);
         }
         @else {
           // Calculate the minimum value
-          $value-min: $rfs-base-value + divide(abs($value) - $rfs-base-value, $rfs-factor);
+          $value-min: $rfs-base-value + divide(math.abs($value) - $rfs-base-value, $rfs-factor);
 
           // Calculate difference between $value and the minimum value
-          $value-diff: abs($value) - $value-min;
+          $value-diff: math.abs($value) - $value-min;
 
           // Base value formatting
           $min-width: if($rfs-unit == rem, #{divide($value-min, $rfs-rem-value)}rem, #{$value-min}px);
@@ -274,7 +282,7 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
   }
 
   // Remove first space
-  @return unquote(str-slice($val, 2));
+  @return string.unquote(string.slice($val, 2));
 }
 
 // RFS mixin
@@ -285,7 +293,9 @@ $rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height
 
     // Do not print the media query if responsive & non-responsive values are the same
     @if $val == $fluid-val {
-      #{$property}: $val;
+      & {
+        #{$property}: $val;
+      }
     }
     @else {
       @include _rfs-rule () {