@wordpress/block-library/build-style/embed/editor.css

Block library for the WordPress editor.

/**
 * Breakpoints & Media Queries
 */
.wp-block-embed {
  margin-left: 0;
  margin-right: 0;
  clear: both;
}
.wp-block-embed.is-loading {
  display: flex;
  justify-content: center;
}
.wp-block-embed .wp-block-embed__placeholder-input {
  flex: 1 1 auto;
}
.wp-block-embed .components-placeholder__error {
  word-break: break-word;
}

.wp-block-post-content .wp-block-embed__learn-more a {
  color: var(--wp-admin-theme-color);
}

.block-library-embed__interactive-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
}

.wp-block[data-align=left] > .wp-block-embed,
.wp-block[data-align=right] > .wp-block-embed {
  max-width: 360px;
  width: 100%;
}
.wp-block[data-align=left] > .wp-block-embed .wp-block-embed__wrapper,
.wp-block[data-align=right] > .wp-block-embed .wp-block-embed__wrapper {
  min-width: 280px;
}