FireShot is an easy way to save a screenshot of an entire webpage.
It is OK if you use the Chrome extension "FireShot".
If you use FireShot, you can save it as png and use it for powerpoint. You can also save as pdf.
[FireShot] to save a screenshot of the entire page.
You can add "FireShot" from the link below.
Screenshot the entire web page - FireShot
Click "capture entire page" on the page you want to capture.
Then just select the png or pdf save format and you're good to go.
Please try FireShot.