You definitely can build a web page with html and css. Although if you want to perform some kind of logic (client or server side) it would be a little bit more complex than that.

If you are a beginner in web development, first of all try languages like js or python to do basic stuff (scripting, basic web page logic) and try to identify what do you like more, and go for it, at the end on web development you will have like front and backend specialist and after some time you can become a full stack. You should definitely start with the stuff that calls you into action.