The overflow-y CSS property sets what shows when content overflows a block-level element's top and bottom edges. This may be nothing, a scroll bar, or the overflow content. This property may also be set by using the overflow shorthand property.
According to https://drafts.csswg.org/css-overflow-3/#ref-for-propdef-overflow%E2%91%A3, visible and clip prevent the box from being a scroll container. hidden, scroll and auto force the box into being a scroll container. visible is not ...
I haven't found a "fix" (I tried camel casing, and alternating lower/uppcase etc.), but in my case, I put the max width values within my 'max-width' media query. I discovered that I only needed to apply the max width values for the responsive version of my template. If you can...