*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.menu{
    width: 100%;
    padding: 0.5rem;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    flex-basis: auto;
    justify-content: center;
}
.nav{
    flex-wrap: nowrap !important;
}
.menu .container li{
    display: block;
    list-style: none;
    padding: 1rem;
}
.menu .container li a{
    display: block;
    height: 2rem;
    text-decoration: none;
    color: rgba(0, 0, 0, 0.5);;
    font-size: 1.3vw;
    font-weight: 400;
}
.menu .container li a:hover{
    color:#000;
}
.menu .container .libt a{
    display:block;
}
.menu .container .libt .toolslist{
    position: absolute;
    z-index: 1000;
    background: white;
    box-shadow: 0 1px 2px #666;
    display:none;
    opacity:1;
    padding: 0.5rem 1rem 1rem 0.5rem;
}
.menu .container .libt:hover .toolslist{
    display:block;
}