var posh = (screen.width / 2) -75 ;
var posv = screen.height / 3;

document.getElementById('loading_button').style.position='relative';
//document.getElementById('loading_button').style.padding=posv + 'px 0px 0px ' + posh + 'px';
document.getElementById('loading_button').style.padding='25% 0px 0px 38%';