--- /dev/null
+@mixin box-shadow($shadow...) {
+ @if $enable-shadows {
+ $result: ();
+
+ @each $value in $shadow {
+ @if $value != null {
+ $result: append($result, $value, "comma");
+ }
+ @if $value == none and length($shadow) > 1 {
+ @warn "The keyword 'none' must be used as a single argument.";
+ }
+ }
+
+ @if (length($result) > 0) {
+ box-shadow: $result;
+ }
+ }
+}