This is a bordered box to be used as a banner heading

This is a side navigation box .The box (container was set up to have a small left margin and a width of 20%

It was set up within a <p>...</p> tagwithin the code
The term ‘selector'is used to describe the CSS commands in the same way that HTML uses ‘tag' Sometimes the opening commands are termed tags <style>, <div> , class= etc CSS (Cascading Style Sheets) is a language for describing the rendering of HTML and XML documents on screen, on paper, in speech, etc. To bind style properties to elements in the document, CSS uses selectors, which are patterns that match one or more elements.

this is a block of text with a left margin set up. No top margin is set and it aligns to float to the right of the left block (this is set up in the CSS for the left block. It shows that a block can contain

This is red