By default, images, videos and code blocks are displayed wider than the (text) content around it. This is to make it stand out and give it a little emphasis. An example of this ‘full bleed’ behavior can be seen on the lorem ipsum page.
In some cases this might be a bit overwhelming or distracting.
This behavior can be disabled on a per-post basis by setting the value extraWideMedia: false in the frontmatter of the post. An example of this can be seen on the footer images and links page.
To disable it for all posts, set the value in the posts/posts.json file.
{
...
"extraWideMedia": false
}
Note that disabling the extraWideMedia setting will also disable unconstrained (full width) images.