Editing the html code to style text elements

Make me move to the left!

Make me move to the right!

Can you centre me on the page?

Can you change my font size to 12px?

Can you change my font size to 28px?

Can you change my colour to blue?

Can you change my colour to red?

Can you change my colour to purple,
my font size to 8px and send me to the left?

Can you change my colour to green,
my font size to 25px and send me to the right?

How can you change my appearance?