html - How to display image in the center of a div

Question

I have div with ajax-loader gif image

<div id="mydiv" style="height: 400px; text-align: center;">
    <img src="/Content/ajax-loader.gif" class="ajax-loader"/>
</div>

.ajax-loader
{
    /*hidden from IE 5-6 */
    margin-top: 0; /* to clean up, just in case IE later supports valign! */
    vertical-align: middle;
    margin-top: expression(( 150 - this.height ) / 2); 
}

But could not get it displayed in the center (both vertically and horizontally). Need help with that.

question from:https://stackoverflow.com/questions/7123599/how-to-display-image-in-the-center-of-a-div

Answer 1

The following assumes that the width and height of the image is known:

#mydiv {
  height: 400px;
  position: relative;
  background-color: gray; /* for demonstration */
}
.ajax-loader {
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -32px; /* -1 * image width / 2 */
  margin-top: -32px; /* -1 * image height / 2 */
}

<div id="mydiv">
  <img src="http://dummyimage.com/64x64/000/fff.gif&text=LOADING" class="ajax-loader">
</div>