fixed contained

app.py

@@ -52,17 +52,16 @@ with st.form(key='columns_in_form', clear_on_submit = False):
         max_results = st.number_input("Max papers", value=max_results_current)
         max_results_current = max_results_current
     with c3:
-        with st.container():
-            st.markdown('Pre-print server')
-            checks = st.columns(4)
-            with checks[0]:
-                ArXiv_check = st.checkbox('ArXiv')
-            with checks[1]:
-                ChemArXiv_check = st.checkbox('ChemArXiv')
-            with checks[2]:
-                BioArXiv_check = st.checkbox('BioArXiv')
-            with checks[3]:
-                MedrXiv_check = st.checkbox('MedrXiv')
+        st.markdown('Pre-print server')
+        checks = st.columns(4)
+        with checks[0]:
+            ArXiv_check = st.checkbox('ArXiv')
+        with checks[1]:
+            ChemArXiv_check = st.checkbox('ChemArXiv')
+        with checks[2]:
+            BioArXiv_check = st.checkbox('BioArXiv')
+        with checks[3]:
+            MedrXiv_check = st.checkbox('MedrXiv')
 
     searchButton = st.form_submit_button(label = 'Search')