fix text color to #666

style/components/collapse.less

@@ -33,7 +33,7 @@
       height: 38px;
       line-height: 38px;
       text-indent: 16px;
-      color: #666;
+      color: @text-color;
       border-bottom: @borderStyle;
       &:before {
         display: inline-block;
@@ -51,7 +51,7 @@
     transition-duration: .3s;
     transition-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
     overflow: hidden;
-    color: #999;
+    color: @text-color;
     padding: 0 16px;
     background-color: #fff;
 

style/components/popover.less

@@ -114,18 +114,18 @@
     line-height: 32px;
     height: 32px;
     border-bottom: 1px solid #e9e9e9;
-    color: #666;
+    color: @text-color;
   }
 
   &-content {
     padding: 8px 16px;
-    color: #999;
+    color: @text-color;
   }
 
   &-message {
     padding: 8px 0 16px;
     font-size: 12px;
-    color: #666;
+    color: text-color;
     .anticon {
       margin-right: 8px;
       color: @error-color;