Did you know that Google Chrome offers extensions to enhance Google Classroom? An extension called Share to Classroom will allow you to take any website, video, etc and share it to your Google Classroom class with just a couple clicks.
Make sure you are signed into Google Chrome and head out to the Chrome Web Store. Search for the Extension called Share to Classroom and install it.
Mine has a green button with Rate it on it because I already have the extension.
If you are trying to install it, it will have a blue Add to Chrome button.