body {
    background: #f8f9fa;
}
.card-body {
    background: #fff;
}
code {
    background: #f1f3f5;
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
}
.ad-slot-top, .ad-slot-inarticle {
    background: #fff;
    border-bottom: 1px solid #eee;
}