diff --git a/src/cool-stuff/css-purgatory/base/scss/base.scss b/src/cool-stuff/css-purgatory/base/scss/base.scss
index 6df6546..3d0f2c6 100644
--- a/src/cool-stuff/css-purgatory/base/scss/base.scss
+++ b/src/cool-stuff/css-purgatory/base/scss/base.scss
@@ -1,3 +1,4 @@
+@use "sass:math";
 @mixin reset {
 /* ----------------- */
 /* Custom Properties */
@@ -17,14 +18,14 @@ $color-white: hsl(0 0% 100%);/* White */
   /* font */
 
   /* Sizes divided by 16 so values given in px */
-$fs-900: calc(125rem / 16);
-$fs-800: calc(75rem / 16);
-$fs-700: calc(56rem / 16);
-$fs-600: calc(32rem / 16);
-$fs-500: calc(28rem / 16);
-$fs-400: calc(24rem / 16);
-$fs-300: calc(18rem / 16);
-$fs-200: calc(16rem / 16);
+$fs-900: math.div(125rem, 16);
+$fs-800: math.div(75rem, 16);
+$fs-700: math.div(56rem, 16);
+$fs-600: math.div(32rem, 16);
+$fs-500: math.div(28rem, 16);
+$fs-400: math.div(24rem, 16);
+$fs-300: math.div(18rem, 16);
+$fs-200: math.div(16rem, 16);
 
 $ff-serif: serif;
 $ff-sans-cond: sans-serif;