.hornav li a {
    border-radius: 5px 5px 0 0;
    height: 40px;
}

.hornav li.active a{
            background-color:#4fa3de;
            color: #fff;
        }

@media only screen and (max-width: 640px) {
    .hornav li {
        border-bottom: 2px solid silver;
        width: 100%;
    }
    .hornav li a {
        border-radius: 0;
        
    }
}