.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;  
            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: #ccc;  
            margin-top: 5px;  
            margin-right: -10px;  
        }  
        .dropdown-submenu:hover > a:after {  
            border-left-color: #fff;  
        }  
        .dropdown-submenu.pull-left {  
            float: none;  
        }  
        .dropdown-submenu.pull-left > .dropdown-menu {  
            left: -100%;  
            margin-left: 10px;  
            -webkit-border-radius: 6px 0 6px 6px;  
            -moz-border-radius: 6px 0 6px 6px;  
            border-radius: 6px 0 6px 6px;  
        }