To create your own CSS styles or override existing CSS styles, you can use one of the following methods:
Go to Theme Customizer, section "Styles", enter the CSS classes into the "Custom CSS" box.
If you have more CSS styles to define, it is better to use a stylesheet to do the editing. You can create a file custom.css in your theme folder then put your custom CSS classes to there. This particular stylesheet will be loaded after the primary stylesheet (style.css) automatically by the theme. Since custom.css does not come with the theme package, so future upgrades of the theme will not overwrite your custom.css stylesheet.
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