.bn-ad {
	display: flex;
	align-items: center;
	justify-content: center;
	max-width: 100%;
	margin: 18px auto;
	overflow: hidden;
	text-align: center;
}

.bn-ad img {
	display: block;
	max-width: 100%;
	height: auto;
}

.bn-ad a {
	display: inline-flex;
	color: inherit;
	text-decoration: none;
}

.bn-ad-header-banner,
.bn-ad-footer-banner,
.bn-ad-in-content {
	width: min(728px, 100%);
	min-height: 90px;
}

.bn-ad-sidebar-top,
.bn-ad-sidebar-middle {
	width: min(300px, 100%);
	min-height: 250px;
}

.bn-ad-mobile-sticky {
	width: min(320px, 100%);
	min-height: 50px;
}

@media (max-width: 640px) {
	.bn-ad-mobile-sticky {
		position: sticky;
		bottom: 0;
		z-index: 900;
		background: #fff;
	}
}