feat: add box-sizing: border-box to scss

Author: j7-dev

js/src/assets/scss/global.scss

@@ -6,6 +6,10 @@
 	z-index: 99;
 }
 
+* {
+	box-sizing: border-box;
+}
+
 body {
 	margin: 0 !important;
 }