Hello @kartik,
Try {% load static %} instead of {% load staticfiles %}
If effect of CSS or any other files doesn't reflect in your template then also write following lines in the end of your settings.py file
STATIC_URL = '/static/'
STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static')]
VENV_PATH = os.path.dirname(BASE_DIR)
STATIC_ROOT = os.path.join(VENV_PATH, 'static_root')
Hope this helps!!
Thank You!!