<style type="text/css">

table{

  border-collapse:collapse;

}

table, td, th{

  border:1px solid black;

}

</style>

.nav-item:after {

    content: '';

    position: absolute;

    right: 16px;

    top: 5px;

    width: 5px;

    height: 5px;

    border: 1px solid #9b9b9b;

    border-width:  1px 1px ;

    transform: rotate(45deg);

    -webkit-transform: rotate(45deg);

    -moz-transform: rotate(45deg);

}