feat (theme): stripe breakpoints units

Author: n-langle

src/scss/01-abstract/_variables.scss

@@ -1,4 +1,5 @@
 @use "sass:map";
+@use "sass:math";
 
 /**
  * Variables
@@ -133,8 +134,8 @@ $breakpoints: (
     admin-bar: 784, // admin bar height change
     md: 1024,
     mdl: 1200,
-    container-default: $container-default + $external-gutter-mobile * 2,
-    container-wide: $container-wide + $external-gutter * 2,
+    container-default: math.div($container-default + $external-gutter-mobile * 2, 1px),
+    container-wide: math.div($container-wide + $external-gutter * 2, 1px),
 );
 // /!\ WARNING: If you use a breakpoint of 1280px, it causes a bug under Window Edge with a device pixel ratio higher than 1. Prefer to use the value 1279px.