bootstrap custom selector popover not working code example

Example: bootstrap 4 popover content from div

.popover-html ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.popover-html ul li {  
    display: inline-block;
    white-space: nowrap;
    width: 33%;
}

.popover-html ul li + li {
  padding-left: 5px;
}