fix button variable

style/components/button.less

@@ -11,22 +11,22 @@
     .btn-primary;
 
     .@{btnPrefixClass}-group &:not(:first-child):not(:last-child) {
-      border-right-color: @btn-primary-border;
-      border-left-color: btn-primary-border;
+      border-right-color: @btn-group-border;
+      border-left-color: @btn-group-border;
     }
 
     .@{btnPrefixClass}-group &:first-child {
       &:not(:last-child) {
-        border-right-color: @btn-primary-border;
+        border-right-color: @btn-group-border;
       }
     }
 
     .@{btnPrefixClass}-group &:last-child:not(:first-child) {
-      border-left-color: @btn-primary-border;
+      border-left-color: @btn-group-border;
     }
 
     .@{btnPrefixClass}-group & + .@{btnPrefixClass} {
-      border-left-color: @btn-primary-border;
+      border-left-color: @btn-group-border;
     }
   }
 

style/mixins/button.less

@@ -14,7 +14,7 @@
   }
   &:active,
   &.active {
-    .button-color(shade(@color, 5%); shade(@background, 5%); shade(@border, 5%));
+    .button-color(shade(@color, 5%); shade(@background, 5%); shade(@background, 5%));
   }
   &:active,
   &.active {
@@ -133,7 +133,7 @@
 
 // primary button style
 .btn-primary() {
-  .button-variant(@btn-primary-color; @btn-primary-bg; @btn-primary-border);
+  .button-variant(@btn-primary-color; @btn-primary-bg; @primary-color);
 
   &:hover,
   &:active,

style/themes/default/custom.less

@@ -46,7 +46,7 @@
 
 @btn-primary-color      : #fff;
 @btn-primary-bg         : @primary-color;
-@btn-primary-border     : shade(@primary-color, 5%);
+@btn-group-border       : shade(@primary-color, 5%);
 
 @btn-default-color      : #666;
 @btn-default-bg         : #f4f4f4;