.article {
    max-width: 450px;
    background: #fff;
    padding: 1.5rem;
    font-family: Verdana, Arial, Helvetica, sans-serif
}

.d-flex {
    display: flex;
}

.jc-center {
    justify-content: center;
}

.site-background {
    background: #f3f3f3;
}