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3-level vertical drop-down menu
A three-level drop-down vertical menu in Bootstrap 3, complete with a ready-made HTML snippet for installation on your website.
* BootstrapTheme Code Snippet.

<link rel="stylesheet" href="https://bootstraptema.ru/plugins/2015/bootstrap3/bootstrap.min.css" />
<style>
 .dropdown-submenu {
 position: relative;
 }
 
 .dropdown-submenu>.dropdown-menu {
 top: 0;
 left: 100%;
 margin-top: -6px;
 margin-left: -1px;
 -webkit-border-radius: 0 6px 6px 6px;
 -moz-border-radius: 0 6px 6px 6px;
 border-radius: 0 6px 6px 6px;
 }
 
 .dropdown-submenu:hover>.dropdown-menu {
 display: block;
 }
 
 .dropdown-submenu>a:after {
 display: block;
 content: " ";
 float: right;
 width: 0;
 height: 0;
 border-color: transparent;
 border-style: solid;
 border-width: 5px 0 5px 5px;
 border-left-color: #cccccc;
 margin-top: 5px;
 margin-right: -10px;
 }
 
 .dropdown-submenu:hover>a:after {
 border-left-color:...