Django: html without CSS and the right text

Question:

First of all, this website that I'm trying to build is my first, so take it easy. Thanks. Anyway, I have my home page, home.html, that extends from base.html, and joke.html, that also extends base.html. The home page works just fine, but not the joke page. Here are some parts of my files, for you to understand how I want my system to work:

views.py

def joke_page(request, joke_id):
    joke = Joke.objects.get(id=int(joke_id))
    return render(request, 'joke.html', {'joke': joke})

urls.py

urlpatterns = [
    url(r'^$', views.home_page, name='home_page'),
    url(r'^(?P<joke_id>[0-9]+)/$', views.joke_page, name='joke_page'),
]  

joke.html

{% extends 'base.html' %}

{% block header_text %}{{ joke.title }}{% endblock %}

{% block text %}{{ joke.text }}{% endblock %}

What I want is that URLs that end like jokes/1/ to render a page with the right html using joke.html. Instead, it renders a page without CSS or with joke.title and joke.text Also, I noticed that jokes/1/ doesn't find anything:

DoesNotExist at /jokes/1/

Joke matching query does not exist.. 

I had 20 jokes in the database and I can find jokes/2/ through jokes/21/, which means their ids have shifted? :P Can someone experienced with Django point out my(many, without a doubt) mistakes? Thank you!

Edit: second urls.py

urlpatterns = [
    url(r'^$', jokes_views.home_page, name='home'),
    url(r'^jokes/', include(jokes_urls)),
    url(r'^admin/', include(admin.site.urls)),
]

Are you using the {% load staticfiles %} in your templates?

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