Update from task 5ed447b2-0be7-4d47-8e58-7b806af1e567

.gitignore

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+```
+# Backup files
+*.py.bak
+```

app.py

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+import streamlit as st
+
+# Set page configuration
+st.set_page_config(
+    page_title="Clean Streamlit UI",
+    page_icon="✨",
+    layout="wide",
+    initial_sidebar_state="auto"
+)
+
+# Main title
+st.title("✨ Clean Streamlit UI")
+st.subheader("A simple, elegant interface")
+
+# Simple form
+with st.form("simple_form"):
+    st.write("Enter some information below:")
+
+    name = st.text_input("Name", placeholder="Enter your name")
+    email = st.text_input("Email", placeholder="Enter your email")
+    message = st.text_area("Message", placeholder="Enter your message here...")
+
+    submitted = st.form_submit_button("Submit")
+
+    if submitted:
+        if name and email and message:
+            st.success(f"Thank you {name}! Your message has been received.")
+            st.balloons()
+        else:
+            st.error("Please fill in all fields.")
+
+# Add some spacing
+st.divider()
+
+# Simple columns layout
+col1, col2 = st.columns(2)
+
+with col1:
+    st.header("Features")
+    st.write("- Simple and clean design")
+    st.write("- Easy to use interface")
+    st.write("- Responsive layout")
+    st.write("- Minimal dependencies")
+
+with col2:
+    st.header("Usage")
+    st.write("1. Fill in the form")
+    st.write("2. Click submit")
+    st.write("3. View results")
+    st.write("4. Enjoy simplicity!")
+
+# Footer
+st.divider()
+st.caption("Built with ❤️ using Streamlit")