diff --git a/src/main.ts b/src/main.ts
index 001d8e7..45d1d50 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -45,6 +45,8 @@ async function startRelay() {
   }
 }
 
+if (localStorage.getItem('darkMode') === 'true') document.body.classList.add('dark');
+
 startRelay().then(() => {
   const router = document.createElement('arx-eve-router') as EveRouter;
   router.ccnSetup = !!localStorage.getItem('ncryptsec');
diff --git a/src/routes/Arbor/Home.ts b/src/routes/Arbor/Home.ts
index 4d7e636..797f93f 100644
--- a/src/routes/Arbor/Home.ts
+++ b/src/routes/Arbor/Home.ts
@@ -10,6 +10,8 @@ import '@components/Arbor/ForumTopic';
 import '@components/Arbor/ForumCategory';
 import '@components/General/Prompt';
 
+import type { EvePrompt } from '@components/General/Prompt';
+
 interface ForumTopic {
   id: string;
   title: string;
@@ -29,6 +31,8 @@ export class ArborForum extends LitElement {
   @state()
   private categories: ForumCategory[] = [];
 
+  private isSaving = false;
+
   private topicsQuery: NDKSubscription | undefined;
 
   @state()
@@ -52,6 +56,8 @@ export class ArborForum extends LitElement {
 
   private async doCreateCategory() {
     if (!this.forum) return;
+    if (this.isSaving) return;
+    this.isSaving = true;
     const prompt = this.shadowRoot?.getElementById('new-category-prompt') as EvePrompt;
     const newCategory = prompt.getValue();
 
@@ -94,6 +100,8 @@ export class ArborForum extends LitElement {
     } catch (error) {
       console.error('Failed to create category:', error);
       alert('Failed to create category');
+    } finally {
+      this.isSaving = false;
     }
   }
 
@@ -140,6 +148,7 @@ export class ArborForum extends LitElement {
           (category) => category.id === event.tags.find((tag) => tag[0] === 'd')?.[1].split(':')[1],
         );
         if (categoryId === -1) return;
+        if (this.categories[categoryId].topics.find((topic) => topic.id === event.id)) return;
         this.categories[categoryId].topics = [
           ...this.categories[categoryId].topics,
           {