prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  too much space below video, not deletable in wagtail 
  ![wagtail bug](https://cloud.githubusercontent.com/assets/24652917/21648586/c86d744c-d29e-11e6-83b0-120667f43c41.jpg)
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `home/wagtail_hooks.py`
  Content:
  ```
  1 from django.conf import settings
  2 from django.utils.html import format_html
  3 from wagtail.wagtailcore import hooks
  4 
  5 
  6 @hooks.register('insert_editor_css')
  7 def editor_css():
  8     return format_html('<link rel="stylesheet" href="'
  9                        + settings.STATIC_URL
  10                        + 'scss/wagtail_admin/wagtail_admin.css">')
  11
  ```
  --- 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()
  
  ```
  
golden_diff: diff --git a/home/wagtail_hooks.py b/home/wagtail_hooks.py
  --- a/home/wagtail_hooks.py
  +++ b/home/wagtail_hooks.py
  @@ -7,4 +7,4 @@
   def editor_css():
       return format_html('<link rel="stylesheet" href="'
                          + settings.STATIC_URL
  -                       + 'scss/wagtail_admin/wagtail_admin.css">')
  +                       + 'wagtail_admin.css">')
  
verification_info: {"golden_diff": "diff --git a/home/wagtail_hooks.py b/home/wagtail_hooks.py\n--- a/home/wagtail_hooks.py\n+++ b/home/wagtail_hooks.py\n@@ -7,4 +7,4 @@\n def editor_css():\n     return format_html('<link rel=\"stylesheet\" href=\"'\n                        + settings.STATIC_URL\n-                       + 'scss/wagtail_admin/wagtail_admin.css\">')\n+                       + 'wagtail_admin.css\">')\n", "issue": "too much space below video, not deletable in wagtail \n![wagtail bug](https://cloud.githubusercontent.com/assets/24652917/21648586/c86d744c-d29e-11e6-83b0-120667f43c41.jpg)\r\n\n", "before_files": [{"content": "from django.conf import settings\nfrom django.utils.html import format_html\nfrom wagtail.wagtailcore import hooks\n\n\n@hooks.register('insert_editor_css')\ndef editor_css():\n    return format_html('<link rel=\"stylesheet\" href=\"'\n                       + settings.STATIC_URL\n                       + 'scss/wagtail_admin/wagtail_admin.css\">')\n", "path": "home/wagtail_hooks.py"}], "after_files": [{"content": "from django.conf import settings\nfrom django.utils.html import format_html\nfrom wagtail.wagtailcore import hooks\n\n\n@hooks.register('insert_editor_css')\ndef editor_css():\n    return format_html('<link rel=\"stylesheet\" href=\"'\n                       + settings.STATIC_URL\n                       + 'wagtail_admin.css\">')\n", "path": "home/wagtail_hooks.py"}]}