diff --git a/classquiz/oauth/github.py b/classquiz/oauth/github.py
index c95a618..3d0f53b 100644
--- a/classquiz/oauth/github.py
+++ b/classquiz/oauth/github.py
@@ -51,7 +51,7 @@ class GitHubOauthResponse(BaseModel):
     events_url: Optional[str] = None
     received_events_url: Optional[str] = None
     type: Optional[str] = None
-    site_admin: Optional[str] = None
+    site_admin: Optional[bool] = None
     name: Optional[str] = None
     company: Optional[str] = None
     blog: Optional[str] = None
@@ -103,7 +103,8 @@ async def auth(request: Request, response: Response):
     except authlib.integrations.base_client.OAuthError:
         return RedirectResponse("/account/oauth-error")
     resp = await oauth.github.get("user", token=token)
-    user_data = GitHubOauthResponse(**resp.json())
+    data = resp.json()
+    user_data = GitHubOauthResponse(**data)
     if user_data.email is None:
         return RedirectResponse("/account/oauth-error?error=email")
     user_in_db = await User.objects.get_or_none(email=user_data.email)
@@ -140,7 +141,10 @@ async def auth(request: Request, response: Response):
             else:
                 raise HTTPException(status_code=500, detail=str(e))
     user = await User.objects.get_or_none(
-        email=user_data.email, username=user_data.login, auth_type=UserAuthTypes.GITHUB, verified=True
+        email=user_data.email,
+        username=user_data.login,
+        auth_type=UserAuthTypes.GITHUB,
+        verified=True,
     )
 
     await log_user_in(user=user, request=request, response=response)
diff --git a/classquiz/oauth/init_oauth.py b/classquiz/oauth/init_oauth.py
index 2da4c8f..91c6bcf 100644
--- a/classquiz/oauth/init_oauth.py
+++ b/classquiz/oauth/init_oauth.py
@@ -4,15 +4,37 @@
 
 
 from authlib.integrations.starlette_client import OAuth
-from classquiz.config import settings
+from classquiz.config import settings, redis
 from functools import lru_cache
+import json
 
 settings = settings()
 
 
+class RedisCache:
+    def __init__(self) -> None:
+        pass
+
+    async def get(self, key: str) -> str | None:
+        value = await redis.get(f"authlib:{key}")
+        if value is None:
+            return None
+        try:
+            return json.loads(value)
+        except json.JSONDecodeError:
+            return value
+
+    async def set(self, key: str, value: str, expires: int | None = None):
+        data = json.dumps(value)
+        await redis.set(f"authlib:{key}", data, ex=expires)
+
+    async def delete(self, key: str) -> None:
+        await redis.delete(key)
+
+
 @lru_cache()
 def init_oauth() -> OAuth:
-    oauth = OAuth()
+    oauth = OAuth(cache=RedisCache())
     if settings.google_client_secret is not None and settings.google_client_id is not None:
         oauth.register(
             name="google",
diff --git a/frontend/src/routes/account/login/+page.svelte b/frontend/src/routes/account/login/+page.svelte
index 4081249..fd88a5c 100644
--- a/frontend/src/routes/account/login/+page.svelte
+++ b/frontend/src/routes/account/login/+page.svelte
@@ -88,7 +88,7 @@ SPDX-License-Identifier: MPL-2.0
 <svelte:head>
 	<title>ClassQuiz - Login</title>
 </svelte:head>
-<div class="flex items-center justify-center h-screen
+<div class="flex items-center justify-center h-screen">
 	{#if verified}
 		<VerifiedBadge />
 	{/if}