_button-group.scss in bootstrap-4.0.0.alpha3

- old
+ new

@@ -25,11 +25,11 @@
 .btn-group {
   .btn + .btn,
   .btn + .btn-group,
   .btn-group + .btn,
   .btn-group + .btn-group {
-    margin-left: -1px;
+    margin-left: -$input-btn-border-width;
   }
 }
 
 // Optional: Group multiple button groups together for a toolbar
 .btn-toolbar {
@@ -165,10 +165,10 @@
 
   > .btn + .btn,
   > .btn + .btn-group,
   > .btn-group + .btn,
   > .btn-group + .btn-group {
-    margin-top: -1px;
+    margin-top: -$input-btn-border-width;
     margin-left: 0;
   }
 }
 
 .btn-group-vertical > .btn {