.wp-block-custom-highlight {
  border-left: 4px solid #ccc;
  padding: 1em;
  margin: 1.5em 0;
  border-radius: 4px;
}

.wp-block-custom-highlight .block-editor-inner-blocks,
.wp-block-custom-highlight .wp-block-inner-blocks {
  margin: 0;
}

.wp-block-custom-highlight .block-editor-block-list__layout > *:first-child {
  margin-top: 0;
}

.wp-block-custom-highlight .block-editor-block-list__layout > *:last-child {
  margin-bottom: 0;
}