Fix Timeline dot not working with Tooltip, close #11250

components/timeline/demo/custom.md

@@ -1,6 +1,6 @@
 ---
 order: 4
-title: 
+title:
   zh-CN: 自定义时间轴点
   en-US: Custom
 ---
@@ -9,7 +9,7 @@ title:
 
 可以设置为图标或其他自定义元素。
 
-## en-US 
+## en-US
 
 Set a node as an icon or other custom element.
 

components/timeline/style/index.less

@@ -65,13 +65,13 @@
       border-radius: 0;
       padding: 3px 1px;
       transform: translate(-50%, -50%);
-      top: 5px;
+      top: 5.5px;
       left: 5px;
       width: auto;
     }
 
     &-content {
-      padding: 0 0 0 18px;
+      margin: 0 0 0 18px;
       position: relative;
       top: -(@font-size-base * @line-height-base - @font-size-base) + 1px;
     }