Updated for the new default theme:
/* Display embedded notes in line with other block elements */
/* Remove the embed heading */
.embed-title {
display:none;
}
/* Align embed text with normal text */
.markdown-embed {
padding-left: 0px;
border-left: none;
}
/* Highlight the entire embed when hovering */
/* NOTE: Tested approaches to highlight the embed only when hovering
* over the embed link. These conflicted with other styles and mouse
* events. I opted for the simpler approach and kept it subtle. */
.markdown-embed:hover {
backdrop-filter: invert(1%);
box-shadow: 0 0 1px 3px rgba(136, 136, 136, 0.1);
}