.listenmenu ul {
  padding: 0;
  margin: 0;
  list-style-type: none;
  position: relative;
}
.listenmenu li {
  list-style-type: none;
  border-left: 2px solid var(--nv-txt);
  margin-left: 1em;
}
.listenmenu li div {
  padding-left: 1em;
  position: relative;
}
.listenmenu li div::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -2px;
    bottom: 50%;
    width: 0.75em;
    border: 2px solid var(--nv-txt);
    border-top: 0 none transparent;
    border-right: 0 none transparent;
    height: 15px;
}