Check out example codes for "static css is not fetching style in django". It will help you in understanding the concepts better.

Code Example 1

STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static'), ]

Code Example 2

First : create static folder in this path (tree path):
-------static #this si your static folder!
Second : put you CSS (or JavaScript or an image) in your static folder like this:

Third : put this at the bottom of your file:

STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'static')
4th : call your static file in your template:

{% load staticfiles %}
<link rel="stylesheet" href="src="{% static "1.css" %}"">
<link rel="stylesheet" href="src="{% static "1.css" %}"">
It should work.

Note : use {% load static %} at the start of the css file

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