Showing blank window in streamlit app

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Recently I have dowloaded streamlit while download it doesn’t shown error. But when I run the code I am not seeing any change in streamlit app.
I am running in vscode just starting with streamlit.
While running is not showing any error, just it not showing changes.
My streamlit version is 1.36.0 and python version is 3.9.6 64bit.

my code is:
import streamlit as st

st.title(‘Movie Recommender System’)
st.write(‘This is a simple Streamlit app.’)

but the webpage is:

my code look like: