clea up code and layout

app/tools/load_css.py

@@ -0,0 +1,8 @@
+import streamlit as st
+from pathlib import Path
+
+
+def load_css():
+    css_path = Path(__file__).parent.parent / ".streamlit" / "style.css"
+    if css_path.exists():
+        st.markdown(f"<style>{css_path.read_text()}</style>", unsafe_allow_html=True)