app/assets/stylesheets/umlaut/_mixins.scss in umlaut-3.3.1 vs app/assets/stylesheets/umlaut/_mixins.scss in umlaut-4.0.0.beta1

@@ -2,11 +2,11 @@
   // double left gutter/margin when big enough
   padding-left: $umlautContainerPadding * 2;
   padding-right: $umlautContainerPadding * 2;
   
   // get rid of double left margin at smaller
-  @media (max-width: 767px) {
+  @media (max-width: $screen-sm-min) {
     padding: {
       left: $umlautContainerPadding;
       right: $umlautContainerPadding;
     }
   }
@@ -27,11 +27,10 @@
     repeat: no-repeat;
   }
   display: inline-block;
   width: 16px;
   height: 16px;
-  @include ie7-restore-right-whitespace();
   line-height: 16px;
   vertical-align: top;
   margin-top: 1px;
 }
 
@@ -56,10 +55,10 @@
   margin-left: -12px; /* so left edge of text still lines up */
   margin-right: -12px;
 
 
   border: 1px solid $borderColor;
-  @include border-radius($baseBorderRadius);
+  border-radius: $border-radius-base;
   @include box-shadow(inset 0 1px 1px rgba(0,0,0,.05));
 }