diff --git a/docs/web/api/tag.en-US.md b/docs/web/api/tag.en-US.md
index 3a0919a8c9..6ae44065c0 100644
--- a/docs/web/api/tag.en-US.md
+++ b/docs/web/api/tag.en-US.md
@@ -1,6 +1,6 @@
 ---
 title: Tag 
-description: Definition: Tags are commonly used for marking, categorizing and selecting.
+description: Tags are commonly used for marking, categorizing and selecting.
 isComponent: true
 usage: { title: '', description: '' }
 spline: data
diff --git a/style/mobile/components/back-top/v2/_index.less b/style/mobile/components/back-top/v2/_index.less
index fc5e9f6337..9cc97129b0 100644
--- a/style/mobile/components/back-top/v2/_index.less
+++ b/style/mobile/components/back-top/v2/_index.less
@@ -24,8 +24,11 @@
     width: @back-top-round-width;
     height: @back-top-round-width;
     border-radius: @back-top-round-border-radius;
+
     &::after {
+
       .hairline(@back-top-round-border-color);
+
       border-radius: @back-top-round-border-radius;
     }
   }
@@ -49,8 +52,11 @@
     border-radius: @back-top-half-round-border-radius 0 0 @back-top-half-round-border-radius;
     flex-direction: row;
     right: 0;
+
     &::after {
+
       .hairline(@back-top-round-border-color);
+
       border-radius: @back-top-half-round-border-radius 0 0 @back-top-half-round-border-radius;
     }
   }