How to center a “position: absolute” element

Question

I\'m having a problem centering an element that has the attribute position set to absolute. Does anyone know why the images are not centered?

<

Answer 1

Centering something absolutely positioned is rather convoluted in CSS.

ul#slideshow li {
    position: absolute;
    left:50%;
    margin-left:-20px;

}

Change margin-left to (negative) half the width of the element you are trying to center.