se/SE/stuff/dita-ot-2.3.3/plugins/org.dita.html5/sass/_topic.scss

/* Add space for top level topics */
.nested0 {
  margin-top: 1em;
}

/* div with class=p is used for paragraphs that contain blocks, to keep the XHTML valid */
.p {
  margin-top: 1em;
}