Change quote format

How do I change the format of a quote or a code?

When it says "(this person) wrote:

this

How do I change the format (color, size, borders) of how this is displayed?

Also I want to know how to do it for a code:

Code:

this box

do you mean changing the color of the quote area/background or the letters on it?

zoids25 wrote:do you mean changing the color of the quote area/background or the letters on it?

No, I mean the structure of the box. Like, how can I make the box bigger or more spaced out because the one I have is really small. And yes, could you tell me how to change the color of it also?

you need to learn CSS about this.

zoids25 wrote:you need to learn CSS about this.

I know how to use CSS, but I just don't know the code for it or where it is located in the stylesheet.