Reserve ad space with a ratio

css

/** this code allows to reserve ad space with a ratio, e.g., when width is 100% and height needs to be adjusted dynamically
https://www.w3schools.com/howto/howto_css_aspect_ratio.asp 
"top-banner-ads" is the class of the main container, in Advanced Ads derived from the placement name
**/
.top-banner-ads {
	width: 100%;
	height: auto;
    padding-top: 12.4%; /* 728:90 ratio */
    position: relative;
}
.top-banner-ads > div {
	position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}