diff --git a/eduhelx_jupyterlab_student/handlers.py b/eduhelx_jupyterlab_student/handlers.py
index 7b387a5..21568ee 100644
--- a/eduhelx_jupyterlab_student/handlers.py
+++ b/eduhelx_jupyterlab_student/handlers.py
@@ -337,7 +337,8 @@ async def create_ssh_config_if_not_exists(context: AppContext, course, student)
                 f"   Port { ssh_port }\n" \
                 f"   IdentityFile { ssh_identity_file }\n" \
                 f"   HostName { ssh_private_hostname }\n" \
-                f"   StrictHostKeyChecking no\n"
+                f"   StrictHostKeyChecking no\n" \
+                f"   UserKnownHostsFile /dev/null\n"
             )
     with open(ssh_public_key_file, "r") as f:
         public_key = f.read()
diff --git a/src/components/assignment-panel/assignment-submissions/style.ts b/src/components/assignment-panel/assignment-submissions/style.ts
index 9d4b76a..65f4650 100644
--- a/src/components/assignment-panel/assignment-submissions/style.ts
+++ b/src/components/assignment-panel/assignment-submissions/style.ts
@@ -43,7 +43,7 @@ export const activateSubmissionButtonClass = style({
 
 export const assignmentsListClass = (style as any)({
     flexGrow: 1,
-    // height: 0,
+    height: 0,
     overflowY: 'auto',
     padding: 0,
     /** Adjusting clashing styles caused by using accordion summaries as ListItem components */