Creating custom web page / web part in SharePoint displaying external contant.

Question

Hi all,
I am new to SharePoint and Visual Studio.
I want to do create a web page in SharePoint. I have a site(other then SharePoint), which is displaying the contant using the html / CSS codes. I want to display same data in SharePoint, but I am not sure how I can do that. Does that application page/web page that one creates using VS, supports html /css codes? So that I can just copy/paste the html codes to the application page.
Also, Will the new page enherit the site settings/etc from the parent site? Thanks in advance for your support.