How do you blur a text in a textbox?

Question

http://codropspz.tympanus.netdna-cdn.com/codrops/wp-content/uploads/2012/10/CustomLoginForms_04.jpg

 

I want to ask, how do you blur a text inside the textbox? i want to put the "insert your username" and "insert your password" into them.

i want to create a new project without using a label to label the textbox for username and password. and here is an example. click the link above.

thanks.