The given markdown document is a link to a page on the Village Pump website, specifically about the “のびのびドロップダウン” feature. The link leads to a page with more information about this feature.
The content below the link is a code snippet written in CSS. The code is modifying the styling of a dropdown menu in a navigation bar. It sets the minimum width of the dropdown menu to 100% of its parent element and the maximum height to the viewport height minus 130 pixels. It also enables vertical scrolling if the content of the dropdown menu exceeds its maximum height.