I am trying to change the default top spacing (margin) for the Embed block used in Gutenberg. I noticed that for some reason, the default setting is

.wp-block-embed {
  margin: 0 0 1em;

which resets the top margin and removes the space between the preceding component.

My site is currently running a child block theme. I decided to apply global style override by adding the following to theme.json:

    "version": 2,
    "$schema": "https://schemas.wp.org/wp/6.4/theme.json",
    "styles": {
        "blocks": {
            "core/embed": {
                "spacing": {
                    "margin": {
                        "top": "2rem"

And this in fact adds the new top margin to the CSS, however it's earlier in the CSS compared to the original one, thus the override does not work:

Chrome dev tools

I checked the location of that base 0 0 1em style and it is in:


Is there a smart way to override that spacing? I'd prefer to avoid overriding in theme's style.css as this seems wrong since theme.json has appeared.

It is probably worth mentioning that I am aware that I can change the spacing through Gutenberg Editor, however I want to apply the default, globally, when it comes to spacing.

  • It seems wrong that the theme.json change you made gets output earlier than the default. It may be worth checking if it’s a reported bug and reporting it if not. It seems ideally the change would replace the default not have both output. 🤷🏼‍♂️
    – stokesman
    Mar 15 at 17:04
  • 1
    I could not find anything that would related to my issue. Created a bug, if anyone is interested: github.com/WordPress/gutenberg/issues/59934.
    – Dandry
    Mar 17 at 13:57

1 Answer 1


Use a Global Styles Filter to override the style:

add_filter( 'wp_theme_json_data_default', function ( $theme_json ){
    $new_data = array(
        'version'  => 2,
        'styles' => [
            'blocks' => [
                'core/embed' => [
                    'spacing' => [
                        'margin' => [
                            'top' => '2rem'

    return $theme_json->update_with( $new_data );

An alternative that may also work is using the Global Styles UI in the (Site) Editor to change the default style of the block. Yet I think that’s not a viable option if you want your override to be part of a version-controlled theme.

  • I was not aware of this filter, thank you. But this also seems like a workaround...
    – Dandry
    Mar 17 at 13:34

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