code is poetry

Here, that’s an image overlaid onto the actual text using CSS image replacement techniques.

so can you explain how i can do similar thing

Try using Firefox with the Firebug add-on to examine the Code Is Poetry line in the footer of these forums. Or use whatever developer tool is available in your web browser. That should give you a good idea of how this has been achieved,

am not good at codes but if u can provide the line of code and what file to add it to in childtheme i will be glad,i have a childtheme

Firebug will do what you’re asking us to, it will show you the line(s) of code that is responsible for what you see on the page.

CSS goes in your Child Theme style.css file.