_button-group.scss in bootstrap-4.0.0.alpha5

- old
+ new

@@ -8,9 +8,10 @@
   vertical-align: middle; // match .btn alignment given font-size hack above
 
   > .btn {
     position: relative;
     float: left;
+    margin-bottom: 0;
 
     // Bring the "active" button to the front
     &:focus,
     &:active,
     &.active {