add website to dock in High Sierra
I'm running macOS High Sierra version 10.13.6 on a late 2013 iMac. I used to be able to put a website link from Safari into the dock on the right side. Now I'm using Safari version (version 11.1.2) and even though I select, click and drag the URL to the dock, the dock doesn't accept it. Any suggestions about how to get the link into the dock?
iMac (27-inch, Late 2013), OS X Yosemite (10.10.3)