JSFiddle: add missing <style> and <script>

examples/docs/zh-CN/tooltip.md

@@ -107,6 +107,40 @@
     </el-tooltip>
   </div>
 </div>
+
+<style>
+  .box {
+    width: 400px;
+
+    .top {
+      text-align: center;
+    }
+
+    .left {
+      float: left;
+      width: 60px;
+    }
+
+    .right {
+      float: right;
+      width: 60px;
+    }
+
+    .bottom {
+      clear: both;
+      text-align: center;
+    }
+
+    .item {
+      margin: 4px;
+    }
+    
+    .left .el-tooltip__popper,
+    .right .el-tooltip__popper {
+      padding: 8px 10px;
+    }
+  }
+</style>
 ```
 :::