Fix variable reference in student ID display within main function of app.py

app.py

@@ -157,7 +157,7 @@ def main():
                         
                         with col1:
                             st.markdown("<p class='big-font'>ID</p>", unsafe_allow_html=True)
-                            st.write(f"{record['student_id']}")
+                            st.write(f"{student['student_id']}")
 
                         with col2:
                             st.markdown("<p class='big-font'>Grade</p>", unsafe_allow_html=True)