CSS Vertical-Align once and for all

center.css

/* 
 * Example of use: 
<some_dom_element center>
Or: 
<some_dom_element valign> 
*/
*[center]{position:absolute;left:50%;top:50%;transform:translateX(-50%) translateY(-50%);}
*[valign]{position:absolute;top:50%;transform:translateY(-50%);}