Add automatically some margin after images are inserted on Gutternberg

Hello. Currently, the default Pages and Posts don't add any margin when a new image is added, and hence I have to add an extra line break for it to lookgood. Check all the images in this article (except the featured image): https://giveawaylisting.com/the-talk-giveaways/
How to add CSS to automatically have some margin between the bottom of the image and the new text that follows? (header or plain text)

Thanks!