This is not as common1 meet native desktop applications in which the entire application scrolls. Of course, there can often be regions on a particular page, page, or section that scrolls, but the presentation of the application is usually static and that is what users are asking for. usually wait.
historically2This forced the designer to adapt the elements to a defined area, often using exact pixel offsets or percentages.
However, the Web is different. Web sites are almost always vertically structured documents that allow pages to extend beyond the visible window.
With this understanding, developers are not limited by the dimensions of the browser window because the overflow can simply expand, causing the page to scroll. When it is used correctly, increasing spaces can be a very good tool to allow a user to digest sections of the page at once without being overloaded.
So, I would not worry so much about trying to fit your form so that it fits on a page as before. What happens if your user uses a small monitor, uses a low resolution, or has increased the font size or zoom ratio? It is perfectly normal for the Web version to overflow as Web pages often do.
1. Based on my observations.
2. Many modern desktop applications, such as those that follow Microsoft's new fluid design guidelines, have adopted a responsive column design that allows elements to reposition themselves based on the width of the device.