fix: login theme switch with picture (#352)

Author: lukasvinclav

src/unfold/templates/admin/login.html

@@ -25,7 +25,7 @@
 
 {% block base %}
     <div class="flex min-h-screen">
-        <div class="flex flex-grow items-center justify-center mx-auto px-4">
+        <div class="flex flex-grow items-center justify-center mx-auto px-4 relative">
             <div class="w-full sm:w-96">
                 <h1 class="font-semibold mb-10">
                     <span class="block text-gray-700 dark:text-gray-200">{% trans 'Welcome back to' %}</span>