We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
st.expander cuts off sliders
# Summary

Expander in sidebar cuts off sliders and potentially other stuff

# Steps to reproduce
Run the following code
```
import streamlit as st

sidebar_expander = st.sidebar.beta_expander("Bad sliders underneath!")
with sidebar_expander:
    st.slider("Bad layout slider 1", 0, 100, value=0)
    st.slider("Bad layout slider 2", 0, 100, value=(0,100))

st.sidebar.slider("Good layout slider")
```
## Expected behavior:

Sliders appear nicely under the expander

## Actual behavior:

Sliders ends are cut off under the expander (see picture)

![image](https://user-images.githubusercontent.com/62385461/96776145-e4638580-13e8-11eb-9eaf-692c45541cf1.png)


## Is this a regression?

No

# Debug info

- Streamlit version:  0.69.1
- Python version: 3.8.2
- Using PipEnv
- OS version: Windows 10
- Browser version: Firefox and Chrome, recent versions

# Additional information

May also happen in containers outside of sidebar? Have not checked it though..

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `e2e/scripts/st_expander.py`
Content:
```
1 # Copyright 2018-2020 Streamlit Inc.
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #    http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 import streamlit as st
16 
17 container = st.beta_container()
18 container.write("I cannot collapse")
19 
20 expander = st.beta_expander("Collapse me!", expanded=True)
21 expander.write("I can collapse")
22 
23 collapsed = st.beta_expander("Expand me!")
24 collapsed.write("I am already collapsed")
25 
26 sidebar = st.sidebar.beta_expander("Expand me!")
27 sidebar.write("I am in the sidebar")
28
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/e2e/scripts/st_expander.py b/e2e/scripts/st_expander.py
--- a/e2e/scripts/st_expander.py
+++ b/e2e/scripts/st_expander.py
@@ -19,6 +19,8 @@
 
 expander = st.beta_expander("Collapse me!", expanded=True)
 expander.write("I can collapse")
+expander.slider("I don't get cut off")
+expander.button("I'm also not cut off (while focused)")
 
 collapsed = st.beta_expander("Expand me!")
 collapsed.write("I am already collapsed")

{"golden_diff": "diff --git a/e2e/scripts/st_expander.py b/e2e/scripts/st_expander.py\n--- a/e2e/scripts/st_expander.py\n+++ b/e2e/scripts/st_expander.py\n@@ -19,6 +19,8 @@\n \n expander = st.beta_expander(\"Collapse me!\", expanded=True)\n expander.write(\"I can collapse\")\n+expander.slider(\"I don't get cut off\")\n+expander.button(\"I'm also not cut off (while focused)\")\n \n collapsed = st.beta_expander(\"Expand me!\")\n collapsed.write(\"I am already collapsed\")\n", "issue": "st.expander cuts off sliders\n# Summary\r\n\r\nExpander in sidebar cuts off sliders and potentially other stuff\r\n\r\n# Steps to reproduce\r\nRun the following code\r\n```\r\nimport streamlit as st\r\n\r\nsidebar_expander = st.sidebar.beta_expander(\"Bad sliders underneath!\")\r\nwith sidebar_expander:\r\n    st.slider(\"Bad layout slider 1\", 0, 100, value=0)\r\n    st.slider(\"Bad layout slider 2\", 0, 100, value=(0,100))\r\n\r\nst.sidebar.slider(\"Good layout slider\")\r\n```\r\n## Expected behavior:\r\n\r\nSliders appear nicely under the expander\r\n\r\n## Actual behavior:\r\n\r\nSliders ends are cut off under the expander (see picture)\r\n\r\n![image](https://user-images.githubusercontent.com/62385461/96776145-e4638580-13e8-11eb-9eaf-692c45541cf1.png)\r\n\r\n\r\n## Is this a regression?\r\n\r\nNo\r\n\r\n# Debug info\r\n\r\n- Streamlit version:  0.69.1\r\n- Python version: 3.8.2\r\n- Using PipEnv\r\n- OS version: Windows 10\r\n- Browser version: Firefox and Chrome, recent versions\r\n\r\n# Additional information\r\n\r\nMay also happen in containers outside of sidebar? Have not checked it though..\n", "before_files": [{"content": "# Copyright 2018-2020 Streamlit Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#    http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport streamlit as st\n\ncontainer = st.beta_container()\ncontainer.write(\"I cannot collapse\")\n\nexpander = st.beta_expander(\"Collapse me!\", expanded=True)\nexpander.write(\"I can collapse\")\n\ncollapsed = st.beta_expander(\"Expand me!\")\ncollapsed.write(\"I am already collapsed\")\n\nsidebar = st.sidebar.beta_expander(\"Expand me!\")\nsidebar.write(\"I am in the sidebar\")\n", "path": "e2e/scripts/st_expander.py"}], "after_files": [{"content": "# Copyright 2018-2020 Streamlit Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#    http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport streamlit as st\n\ncontainer = st.beta_container()\ncontainer.write(\"I cannot collapse\")\n\nexpander = st.beta_expander(\"Collapse me!\", expanded=True)\nexpander.write(\"I can collapse\")\nexpander.slider(\"I don't get cut off\")\nexpander.button(\"I'm also not cut off (while focused)\")\n\ncollapsed = st.beta_expander(\"Expand me!\")\ncollapsed.write(\"I am already collapsed\")\n\nsidebar = st.sidebar.beta_expander(\"Expand me!\")\nsidebar.write(\"I am in the sidebar\")\n", "path": "e2e/scripts/st_expander.py"}]}