Update default.vue

layouts/default.vue

 <template>
     <div class="flex h-screen">
-        <div class="bg-gray-100 dark:bg-gray-800 w-64 flex flex-col">
+        <div class="fixed top-0 bg-gray-100 dark:bg-gray-800 w-64 flex flex-col min-h-screen">
             <div class="flex-grow">
                 <h1>GitBot</h1>
             </div>
@@ -14,7 +14,7 @@
                 />
             </div>
         </div>
-        <div class="bg-white dark:bg-gray-900 flex-grow p-6">
+        <div class="ml-64 flex-grow bg-white dark:bg-gray-900 flex-grow p-6">
             <slot />
         </div>
     </div>