Adjusting space between images

You may try the below code to add space and make it to like this screenshot: https://share.cleanshot.com/SZ6zCsgM

.wp-block-image.size-large {
  margin: 5px !important;
}

Sorry, I forgot to tell you.

You could add on Appearances > Additional CSS. So when you update WordPress core, theme, or plugin, the changes won’t disappear.

• This reply was modified 3 years, 2 months ago by Faisal Ahammad.

Yes, you’re right. Please paste the code there. That was my typo error.

Here is the full path: Appearances > Customizer > Additional CSS.