Update app.py

app.py

@@ -10,7 +10,7 @@ def generate_pptx(lesson_topic):
     "\n\nFor the first slide, include the lesson title and any relevant sub-points such as. Also, include a closing slide with takeaways from the lesson. Choose a PowerPoint theme from these options: dark, light, corporate, or playful, depending on the lesson's context."
     "\n\nThe output should be suitable for use with the python-pptx library to create a PowerPoint presentation.\n\n"
     "Lesson Plan:\n\n"
-    "lesson_plan_content\n\n"
+    "{lesson_topic}\n\n"
     "For each slide, provide this information:\n\n"
     "#. Slide (slide_title):\n"
     "Heading: concise_heading\n"