Step 1 – Navigate to the Appearance > Customize page from the admin panel menu.
Step 2 – You will see the theme customization panel on this page. Click on the ‘Additional CSS’ tab from the left pane.
Step 3 – The tab has a simple box where you can add your custom CSS codes. Add all your custom CSS codes to this field.
Step 4 – Click on the ‘Save & Publish’ button on the top when you are finished.