Taken from this link there are several other options for adding your own CSS, if you don’t want to put it in the theme:
- Use Theme Options and paste in CSS
- Use a plugin to insert CSS/JS. You could also write your own plugin to ‘host’ the CSS file neatly in wp-content/plugins/ somewhere.
- Use a child theme, which will maintain your changes if your theme changes.
More info on each of these is in the link
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