*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
main{
    background-image: url(/img/testfoto.jpg);
    background-size: cover;
    background-position: center;
    height: 100vh;
}
ul{
    display: flex;
    flex-direction: row;
    justify-content: center;
}
li{
    list-style: none;
    padding: 1rem;
}
li a{
    text-decoration: none;
}
.welkom {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}