Merge branch 'master' of github.com:ant-design/ant-design

components/back-top/demo/basic.md

@@ -19,7 +19,9 @@ import { BackTop } from 'antd';
 ReactDOM.render(
   <div>
     <BackTop />
-    Scroll down to see the bottom right <strong>gray</strong> button.
+    Scroll down to see the bottom-right
+    <strong style={{ color: 'rgba(64, 64, 64, 0.6)' }}> gray </strong>
+    button.
   </div>,
   mountNode
 );

components/back-top/demo/custom.md

@@ -22,7 +22,9 @@ ReactDOM.render(
     <BackTop>
       <div className="ant-back-top-inner">UP</div>
     </BackTop>
-    Scroll down to see the bottom right <strong>blue</strong> button.
+    Scroll down to see the bottom-right
+    <strong style={{ color: '#57c5f7' }}> blue </strong>
+    button.
   </div>,
   mountNode
 );