update UI

app.py

@@ -15,8 +15,12 @@ def save_uploaded_file(uploaded_file):
 st.title('Paper2Slides')
 
 st.subheader('Upload paper in pdf format')
-uploaded_file = st.file_uploader("Choose a file")
-option = st.selectbox(
+
+col1, col2 = st.columns(2)
+with col1:
+    uploaded_file = st.file_uploader("Choose a file")
+with col2:
+    option = st.selectbox(
         'Please select one of the parsing method.',
         ('monkey', 'x2d', 'lxml'))