wget -r -np -k https://www.google.com

Other useful options:

-nd (no directories): download all files to the current directory
-e robots=off: ignore restrictions in robots.txt file and don't download robots.txt files
-A png,jpg: accept only files with the extensions png or jpg
-m (mirror): -r --timestamping --level inf --no-remove-listing
-nc, --no-clobber: Skip download if files exist

from https://apple.stackexchange.com/questions/100570/getting-all-files-from-a-web-page-using-curl