Change html font size to 100% so browser font size settings are respe… (

#3475)

Co-authored-by: rmccar <[email protected]>

src/scss/base/_typography.scss

@@ -1,7 +1,7 @@
 html {
     @include font-smoothing;
 
-    font-size: $base;
+    font-size: calc((100% / 16) * strip-unit($base));
 }
 
 body {

src/scss/helpers/_mq.scss

@@ -57,7 +57,7 @@
 /// @return {Number} - Unitless number
 @function strip-unit($number) {
     @if meta.type-of($number) == 'number' and not math.is-unitless($number) {
-        @return $number / ($number * 0 + 1);
+        @return math.div($number, ($number * 0 + 1));
     }
 
     @return $number;