I downloaded source code of this page using below command :
wget -E -H -k -K -p https://www.greetingsisland.com/design/invitations/surrealism-balloons/201-14150
but it downloaded all css, js, imags in one file....
but i need to download all the css, js files separately as mentioned in view page source
Note: using above link for learning purpose, not for commercial use