.nav{
    width: 100%;
    border-top: 1px solid #cccccc;
    border-bottom: 1px solid #cccccc;
    height: 60px;
    line-height: 60px;
}
.nav ul{
    display: flex;
    justify-content: center;
}
.nav ul li{
    list-style: none;
    margin: -15px 20px;
}
.nav ul li a{
    color: black;
    text-decoration: none;
}
.nav ul li a:hover{
    color: blue;
}
.video{
    text-align: center;
}