modals.less in bootstrap-generators-3.3.1

- old
+ new

@@ -28,14 +28,14 @@
   // https://github.com/twbs/bootstrap/pull/10951.
   outline: 0;
 
   // When fading in the modal, animate it to slide down
   &.fade .modal-dialog {
-    .translate3d(0, -25%, 0);
+    .translate(0, -25%);
     .transition-transform(~"0.3s ease-out");
   }
-  &.in .modal-dialog { .translate3d(0, 0, 0) }
+  &.in .modal-dialog { .translate(0, 0) }
 }
 .modal-open .modal {
   overflow-x: hidden;
   overflow-y: auto;
 }
@@ -60,15 +60,13 @@
   outline: 0;
 }
 
 // Modal background
 .modal-backdrop {
-  position: fixed;
+  position: absolute;
   top: 0;
   right: 0;
-  bottom: 0;
   left: 0;
-  z-index: @zindex-modal-background;
   background-color: @modal-backdrop-bg;
   // Fade for backdrop
   &.fade { .opacity(0); }
   &.in { .opacity(@modal-backdrop-opacity); }
 }