ul {
    display: flex;
    flex-direction: column;
    width: 100vw;
    list-style-type: none;
    text-align: center;
    padding-left: 0;
    margin-top: 20vw;
}

li {
    text-align: center;
    padding-top: 15px;
}
li a {
    text-decoration: none;
    color: black;
}

@media (max-width: 768px) {

    body {
        font-size: 30px;
    }

    ul {
        margin-top: 60vw;
    }

    li {
        padding: 20px;
    }
}