Update 03_reference.py

app/pages/03_reference.py

@@ -1,3 +1,17 @@
+# Copyright 2022 Ken Kawamura
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import streamlit as st
 
 st.set_page_config(layout="wide")
@@ -40,4 +54,4 @@ st.markdown("""2. @software{eval-harness, author = {Gao, Leo and
 }""")
 
 st.markdown("""3. For style https://fossheim.io/writing/posts/css-text-gradient/""")
-st.markdown("""4. For style https://css-tricks.com/css-hover-effects-background-masks-3d/""")
+st.markdown("""4. For style https://css-tricks.com/css-hover-effects-background-masks-3d/""")