1. Make a custom CSS is applied for all the site
  1. From Appearance click on “Customize” Then click on “Additional CSS”.

  2. Then put your codes at down are and when finished click on “Publish”.

2. From the child theme

Install the child theme

  1. After activated the child theme, you can edit the theme files with the WordPress Theme File Editor

  2. Then add your CSS code and update the file.

  3. Some hosts are not allowed you to edit from the WordPress Theme File Editor, so edit it from the FTP.

3. Make a custom CSS code is applied for one page, post, or question
  1. Will find this box at each page, post and questions.
  2. Click on Custom CSS code at the meta tabs.
  3. Add your code and click on “Update”.