<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> .tree, .tree ul { margin:0; padding:0; list-style:none } .tree ul { margin-left:1em; position:relative } .tree ul ul { margin-left:.5em } .tree ul:before { content:""; display:block; width:0; position:absolute; top:0; bottom:0; left:0; border-left:1px solid } .tree li { margin:0; padding:0 1em; line-height:2em; color:#369; font-weight:700; position:relative } .tree ul li:before { content:""; display:block; width:10px; height:0; border-top:1px solid; margin-top:-1px; position:absolute; top:1em; left:0 } .tree ul li:last-child:before { background:#fff; height:auto; top:1em; bottom:0 } .indicator { margin-right:5px; } .tree li a { text-decoration: none; color:#369; } .tree li button, .tree li button:active, .tree li button:focus { text-decoration: none; color:#369; border:none; background:transparent; margin:0px 0px 0px 0px; padding:0px 0px 0px 0px; outline: 0; }