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When mode === 'dialog', sticky elements are stacked so we need to apply the box shadow to the top (when sticking to the bottom edge) and bottom (when sticking to the top edge) elements in the stack. From what I can see, we need the version of `nth-child` that supports targeting by selector. As of this date, support for this is only in Safari: https://caniuse.com/#feat=css-nth-child-of Until we can use this version of `nth-child`, we need to use JS to apply the styles.