.period{
    color: #fff;
    background-color: #000;
    padding: 20px 0;
}

.nav2 ul{
    padding: 0;
    margin: 0;
 display: flex;
 text-decoration: none;
 justify-content: space-around;
}

.nav2 ul li{
 list-style: none;
 padding: 10px 20px;
}