React site nav content group styles

App.css

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

li {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60px;
}

li:hover {
    opacity: 0.7;
}

li > span {
    flex: 0 0 100px;
    text-align: left;
    margin-left: 10px;
}