apollo-elements/apollo-elements

diff --git a/node_modules/playground-elements/playground-ide.js b/node_modules/playground-elements/playground-ide.js
index 2a8c02d..4ebc224 100644
--- a/node_modules/playground-elements/playground-ide.js
+++ b/node_modules/playground-elements/playground-ide.js
@@ -173,7 +173,7 @@ let PlaygroundIde = class PlaygroundIde extends LitElement {
         <slot></slot>
       </playground-project>
 
-      <div id="lhs">
+      <div id="lhs" part="lhs">
         <playground-tab-bar
           part="tab-bar"
           .project=${projectId}
@@ -192,7 +192,7 @@ let PlaygroundIde = class PlaygroundIde extends LitElement {
         </playground-file-editor>
       </div>
 
-      <div id="rhs">
+      <div id="rhs" part="rhs">
         ${this.resizable
             ? html `<div
               id="resizeBar"