/*Here We will add some css for style our treeview*/
    .collapseCat {
        width: 15px;
        background-repeat: no-repeat;
        background-position: -36px -17px;
        display: inline-block;
        cursor: pointer;
    }
    .collapseCat:before {
    content: "+";
    padding-right: 8px;
    color:#337ab7;
}
    .expandCat:before {
    content: "-"; 
    padding-right: 8px;
    color:#337ab7;
}
    .expandCat {
        width: 15px;
        background-repeat: no-repeat;
        background-position: -50px -17px;
        display: inline-block;
        cursor: pointer;
    }

    .treeview ul
    {
        font-size:15px;
        font-family:'Open Sans' , "Helvetica Neue" , Helvetica, Arial, sans-serif;
        padding-left:20px;
        list-style:none;
    }
    .treeview > li > a {
        font-weight:bold;
    }
    .treeview li
    {
        line-height:1;
    }
    .treeview li a
    {
        font-size:14px;
        display:inline-block;
        text-decoration:none;
        width:auto;
    }