Border-radius customization for Collapse Panel

components/collapse/style/index.less

@@ -9,7 +9,7 @@
   background-color: @collapse-header-bg;
   border: @border-width-base @border-style-base @border-color-base;
   border-bottom: 0;
-  border-radius: @border-radius-base;
+  border-radius: @collapse-panel-border-radius;
 
   & > &-item {
     border-bottom: @border-width-base @border-style-base @border-color-base;
@@ -17,7 +17,7 @@
     &:last-child {
       &,
       & > .@{collapse-prefix-cls}-header {
-        border-radius: 0 0 @border-radius-base @border-radius-base;
+        border-radius: 0 0 @collapse-panel-border-radius @collapse-panel-border-radius;
       }
     }
 
@@ -99,7 +99,7 @@
 
   &-item:last-child {
     > .@{collapse-prefix-cls}-content {
-      border-radius: 0 0 @border-radius-base @border-radius-base;
+      border-radius: 0 0 @collapse-panel-border-radius @collapse-panel-border-radius;
     }
   }
 

components/style/themes/default.less

@@ -277,6 +277,9 @@
 @animation-duration-base: 0.2s;
 @animation-duration-fast: 0.1s; // Tooltip
 
+//CollapsePanel
+@collapse-panel-border-radius: @border-radius-base;
+
 //Dropdown
 @dropdown-vertical-padding: 5px;
 @dropdown-font-size: @font-size-base;