article {
    margin-bottom:5em;
}

article ul{
    list-style: none;
    justify-content: center;
    display:flex;
    flex-flow: column nowrap;
    align-content: space-between;
}

article ul li{
    text-align: center;
    font-size: 30px;
}

.content-div > h2 {
    text-align: center
}