How do I add custom CSS to the theme?
This is only recommended if you’re confident editing the theme code. If not, you could hire an experienced coder to make the changes for you.
Note:changing theme code should be done with caution as it could break your theme. Please ensure that you take a theme backup before changing any theme code. To take a theme backup click the “Actions” button next to your theme name and choose “Duplicate” from the options.
Now click the “Actions” button again and choose “Edit code”. When the editor opens, click the file named “styles.scss.liquid” in the “Assets” section.
Scroll to the very end of that file and you can add your custom CSS there.
Click “Save” when you’ve added your code.