.card-header {
    text-align: center;
}

@media (max-width: 767px) {
    .container-header {
        padding: 5px 15px 0 15px;
    }

    .site-title {
        font-size: 1.6rem;
        line-height: 1.25;
        margin-bottom: 5px;
    }

    .container-nav {
        padding-top: 0;
        padding-bottom: 0;
    }
}