.bl-ast {
  display: inline-block;
}

.bl-ast div {
  display: flex;
  border: solid;
  padding: 5px;
  margin: 5px;
}

.bl-ast .vert {
  flex-direction: column;
}

.bl-ast .no-border {
  border: none;
  padding: 0px;
}

.bl-ast :hover {
  background: lightgrey;
}

.bl-ast div:has(:hover) {
  background: none;
}