What is CSS how to use in web Application?

What is CSS how to use in web Application?

Html tags, Paired Tags Unpaired Tags:

Paired Tags Unpaired Tags in Html:

What is html how to make html page

Introduction of HTML:

Difference between XHTML and HTML

Difference between XHTML and HTML:

Centering Footer With CSS/HTML

Centering Footer:

Social Icon for Footer using css Example

Social Icon for Footer :

Introduction of CSS how to define and use in html Example

Introduction of CSS: