.nav{
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 100%;
    background-color: rgb(242, 242, 242);
    height: 40px;
}
.nav a{
    color: black;
    text-decoration: none;
}
.nav div{
    display: flex;
    align-items: center;
    justify-content: center;
    height: 40px;
}
.nav .active{
    border-bottom: 3px solid red;
}