import streamlit as st

bg_img = """
<style>
[data-testid="stAppViewContainer"] {
    background-image: url("https://images.unsplash.com/photo-1542273917363-3b1817f69a2d");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}
</style>
"""

# Kodu Streamlit'e uyguluyoruz
st.markdown(bg_img, unsafe_allow_html=True)