if you use the Edge browser, you can press Ctrl + Shift + S, and then select the “Capture Full Page” option to capture a screenshot of an entire webpage, not just the portion viewable in the window.
Chrome makes it a little harder, i think. open Developer Tools (Ctrl + Shift + I), and then Run Command (Ctrl + Shift + P). Then type “screenshot”, and choose the “Capture Full Size Screenshot” option.