The webwallet (per default) connects to a full node (non-block-producing witness node) on the same host via websockets.
The sources can be downloaded from github.
git clone https://github.com/cryptonomex/graphene-ui
They consist of libraries, a JS-console, and the wallet, as well as other tools.
First, we need to install the dependencies via npm:
for I in cli dl web; do cd $I; npm install; cd ..; done
cd ./web npm run build
The resulting assets can be found in the dist folder.