Important
This is the documentation for v3.5.0 and lower, for documentation for v4.0.0 and higher, see https://obsidian-html.github.io/
The second step is to take the generated proper markdown files and convert them into a website. You are looking at the endproduct of this step.
See Features for all the ways in which you can influence this step.
You can for example add in your own stylesheets/script files, edit the default html template (or just provide your own template entirely), turn on/off the Graph view and the Backlinks, among other things.