_borders.scss in bootstrap-4.0.0.beta

- old
+ new

@@ -1,32 +1,47 @@
 //
 // Border
 //
 
+.border          { border: 1px solid $gray-200 !important; }
 .border-0        { border: 0 !important; }
 .border-top-0    { border-top: 0 !important; }
 .border-right-0  { border-right: 0 !important; }
 .border-bottom-0 { border-bottom: 0 !important; }
 .border-left-0   { border-left: 0 !important; }
 
+@each $color, $value in $theme-colors {
+  .border-#{$color} {
+    border-color: $value !important;
+  }
+}
+
+.border-white {
+  border-color: $white !important;
+}
+
 //
 // Border-radius
 //
 
 .rounded {
-  @include border-radius($border-radius);
+  border-radius: $border-radius !important;
 }
 .rounded-top {
-  @include border-top-radius($border-radius);
+  border-top-left-radius: $border-radius !important;
+  border-top-right-radius: $border-radius !important;
 }
 .rounded-right {
-  @include border-right-radius($border-radius);
+  border-top-right-radius: $border-radius !important;
+  border-bottom-right-radius: $border-radius !important;
 }
 .rounded-bottom {
-  @include border-bottom-radius($border-radius);
+  border-bottom-right-radius: $border-radius !important;
+  border-bottom-left-radius: $border-radius !important;
 }
 .rounded-left {
-  @include border-left-radius($border-radius);
+  border-top-left-radius: $border-radius !important;
+  border-bottom-left-radius: $border-radius !important;
 }
 
 .rounded-circle {
   border-radius: 50%;
 }