Django organizes the parts of a project inside of more or less isolated apps. This makes it difficult to have a base.html, that can be easily applied to all .html pages from a centralized location. Luckily there is a way to do so:

  1. open project_name/project_name/ and find the TEMPLATES array and update the ‘DIRS’ : [] to ‘DIRS’: [os.path.join(BASE_DIR, ’templates’)]
  2. Create a directory at root level named templates (that is the root level for that project. Same location as The location of this folder will be project_name/templates
  3. Place all templates here in projects_name/templates that you want to access from all the apps. File: project_name/templates/base.html
  4. Extend this base file from any application-specific template, that might be located at project_name/app_name/templates/app_name/template_file.html by using {% extends “base.html” %}.

based on Stack Overflow answer by Mukesh Kumar.