Make workflows compatible with the dark theme

This CL also contains a minor fix for the workflows menu.

Fixed: twpowertools:146
Change-Id: I754e2695b3ee0f952b8f1c2f05af0533a715684c
diff --git a/src/contentScripts/communityConsole/workflows/components/TwptConfirmDialog.js b/src/contentScripts/communityConsole/workflows/components/TwptConfirmDialog.js
index 8b778e6..38d3420 100644
--- a/src/contentScripts/communityConsole/workflows/components/TwptConfirmDialog.js
+++ b/src/contentScripts/communityConsole/workflows/components/TwptConfirmDialog.js
@@ -5,22 +5,27 @@
 import {css, html, LitElement} from 'lit';
 import {createRef, ref} from 'lit/directives/ref.js';
 
+import {SHARED_MD3_STYLES} from '../../../../common/styles/md3.js';
+
 export default class TwptConfirmDialog extends LitElement {
   static properties = {
     open: {type: Boolean},
     workflow: {type: Object},
   };
 
-  static styles = css`
-    :host {
-      --mdc-dialog-content-ink-color: var(--mdc-theme-on-surface, #000);
-      --mdc-dialog-z-index: 200;
-    }
+  static styles = [
+    SHARED_MD3_STYLES,
+    css`
+      :host {
+        --mdc-dialog-content-ink-color: var(--mdc-theme-on-surface, #000);
+        --mdc-dialog-z-index: 200;
+      }
 
-    .workflow {
-      font-weight: 500;
-    }
-  `;
+      .workflow {
+        font-weight: 500;
+      }
+    `,
+  ];
 
   constructor() {
     super();