added event.css

widget_princessgabi/widget_calendar/templates/widget_calendar/event-details.html

 {%extends 'base.html'%}
 {% load static %}
 {% block stylesheets %}
-<link rel="stylesheet" type="text/css" href="{% static 'widget_calendar/forms.css' %}">
+<link rel="stylesheet" type="text/css" href="{% static 'widget_calendar/event.css' %}">
 {% endblock %}
 {% block title %}{{ object }}{% endblock %}