:root {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;   
}
header {
    text-align: center;
    display: grid;
    grid-row: auto;
}

header p {
    max-width:40rem;
    justify-self: center;
    margin: 0px 30px 0 30px;
}

main form{
    line-height: 50px;
    display: grid;
    grid-template-rows: auto;
    justify-content: center;
}

main form div {
    justify-self: center;
}

main form label {
    justify-self: center;
}

main form button {
    margin-top: 30px;
    margin-left: 10em;
    margin-right: 10em;
    background-color: black;
    color: whitesmoke;
}