How to center an Image?

How can I center an image using uibinder?

This is what I tried and does not work:

.myImage {
    horizontal-align: bottom;
      vertical-align: bottom;
    text-align: bottom;
}


<g:SimplePanel styleName="{style.myImage}">
<g:Image styleName="{style.myImage}"/>
</g:SimplePanel>

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