How to center a (background) image within a div?

#doit {
    background: url(url) no-repeat center;
}

try background-position:center;

EDIT: since this question is getting lots of views, its worth adding some extra info:

text-align: center will not work because the background image is not part of the document and is therefore not part of the flow.

background-position:center is shorthand for background-position: center center; (background-position: horizontal vertical);

Use background-position:

background-position: 50% 50%;

For center or positioning the background image you should use background-position property . The background-position property sets the starting position of a background image from top and left sides of the element . The CSS Syntax is background-position : xvalue yvalue; .

"xvalue" and "yvalue" supported values are length units like px and percentage and direction names like left, right and etc .

The "xvalue" is the horizontal position of the background and starts from top of the element . It means if you use 50px it will be "50px" away from top of the elements . And "yvalue" is the vertical position that has the same condition .

So if you use background-position: center; your background image will be centered .

But I always use this code :

.yourclass {
  background: url(image.png) no-repeat center /cover;
 }

I know it is so confusing but it means :

.yourclass {
  background-image: url(image.png);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

And I know that too the background-size is a new property and in the compressed code what is /cover but these codes means fill background sizing and positioning in windows desktop background .

You can see more details about background-position in here and background-size in here .