Centering

<center> at the very start of a paragraph, heading, quote or list item centers every line of that block, until the block ends.

<center>Every line of this paragraph is centered,
however narrow the screen is.

# <center>A centered heading

Back to normal.

Preview: Commodore 64, 40 columns

                                            
      Every line of this paragraph is       
  centered, however narrow the screen is.   
                                            
             A centered heading             
                                            
  Back to normal.                           
                                            

Rules

• <center> only works at the very start of the block. Elsewhere it’s ignored.
• </center> is accepted and ignored; the block end ends the centering.
• Headings can also be centered for a whole site with the center style word, for example h1: yellow center.