fix：节点hover出现阴影效果

Author: 昔梦

packages/x-flow/src/components/CustomNode/index.less

@@ -3,6 +3,7 @@
   border-radius: 14px;
   position: relative;
   background: #ffffff;
+
   .react-flow__edge-path,
   .react-flow__connection-path {
     stroke: #d0d5dc;
@@ -22,6 +23,7 @@
     transition: all .5s;
   }
   &:hover{
+    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
     .xflow-node-actions-container{
       opacity: 1;
     }