[Answer]-No admin styles after following tutorial

In your INSTALLED_APPS, you have to put 'django.contrib.admin' below'djangocms_admin_style', like:

...
'djangocms_admin_style',
'django.contrib.admin',
...

As the django-cms documentation says:

'djangocms_admin_style',  # for the admin skin. You **must** add 'djangocms_admin_style' in the list **before** 'django.contrib.admin'.

After that, the style can be displayed correctly.