If you’re familiar with HTML and CSS, you can use the Custom CSS field to add your own styles to the cart.
We do not support code customizations. Always test code changes on a duplicated, unpublished version of your theme. We recommend finding help from a professional developer.
STEPS
In your Shopify admin:
Click Duplicate on your current theme.
Click Customize on the duplicated, unpublished theme version.
In your theme editor (Customize):
Click to open App embeds in the side panel.
Click the Flash Cart tab to open the settings.
Enter your CSS code into the Custom CSS field.
Click Save.
Click Preview to review your changes.
Use the preview link to further test your changes on multiple browsers and devices.
After testing, you can go to your Theme library to Publish the duplicated theme with your changes.
