@media only screen and (min-width: 600px) {
    .main {
        width: 80%;
        margin-left: auto;
        margin-right: auto;
    }
    .twolists {
        display: flex; flex-wrap: wrap; justify-content: space-around;
        div {
            display: flex;
            flex-direction: column;
            width: 45%;
        }
    }
}