NOTE: You might want to also check out a similar but very different tutorial called How To Stop Divi Image Crop. That one actually make the gallery use the original uploaded image aspect ratio instead.
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Where To Paste The CSS Code
1. Divi Assistant
If you are using our Divi Assistant plugin, simply paste the code in the CSS tab in the custom code window in the Divi Visual Builder.
2. Child Theme
If you are using a child theme, paste this code into the style.css file. If you don't have a child theme, you can generate a child theme directly on your site or download our free child theme.
3. Divi Theme Options Integration
Otherwise, paste this code in your Divi>Theme Options>Custom CSS code box.
If you need help understanding where to paste the code, please check out our complete guide about where to add custom code In Divi.