body {
    text-align: center;
    font-family: sans-serif;
    display: grid;
    place-items: center;
    height: 100vh;
    background: #000;
}
div {
    background: #fff;
    padding: 2rem;
    border-radius: 1rem;
    width: 14rem;
    box-shadow: 0 0 1rem rgba(0,0,0,.5);
}