how to make a stretchable blog header

while editing the template of my blog i saw that header size is set to 660px by the css property

width:660px

.Now i want to make my header spread across the whole lenth of the browser and also i开发者_StackOverflow don't want to specify some specific length in pixels ,so that the blog don't look odd in widescreen vs normal monitors .how do i do that ?

width: 100% 

should do the job. (Incidentally, if your header is a div or other block element, you can leave the width value away altogether or set it to auto. It will then assume the full width of the surrounding container (in this case, probably the browser window) no matter whether you've specified borders or paddings.