CSS3 animated button

HTML

<link  href="http://fonts.googleapis.com/css?family=Cabin:400,500,600,bold" rel="stylesheet" type="text/css" >

<link  href="http://fonts.googleapis.com/css?family=PT+Sans+Narrow:regular,bold" rel="stylesheet" type="text/css" >

<div id="pagegradient"></div>

    <a class="button">
        <span>press me</span>
    </a>
    
    <br/>
    <a class="button-2">
        <span>Print</span>
    </a>

CSS

body {
    background: #A7A9AC;
    background-image: -webkit-gradient(
        linear,
        left top,
        right top,
        color-stop(.34, rgba(230,237,241,.05)),
        color-stop(.67, rgba(230,237,241,0)));
    -webkit-background-size: 5px 5px;
}

#pagegradient {
  background-image:
        -webkit-gradient(
            radial, 
            50% -50, 
            300, 
            50% 0, 
            0, 
            from(rgba(230, 237, 241, 0)), 
            to(rgba(230, 237, 241, 0.8)));
    
  height:100%;
  left:0px;
  position:absolute;
  top:0;
  width: 600px;
}

.button {
    position: absolute;
    top: 100px;
    left: 200px;
    display: inline-block;
    margin: 0 auto;
    
    -webkit-border-radius: 10px;
    
    -webkit-box-shadow: 
        0px 3px rgba(128,128,128,1), /* gradient effects */
        0px 4px rgba(118,118,118,1),
        0px 5px rgba(108,108,108,1),
        0px 6px rgba(98,98,98,1),
        0px 7px rgba(88,88,88,1),
        0px 8px rgba(78,78,78,1),
        0px 14px 6px -1px rgba(128,128,128,1); /* shadow */
    
    -webkit-transition: -webkit-box-shadow .1s ease-in-out;
} 

.button span {
    background-color: #E8E8E8;
    
    background-image: 
        /* gloss gradient */
        -webkit-gradient(
            linear, 
            left bottom, 
            left top, 
            color-stop(50%,rgba(255,255,255,0)), 
            color-stop(50%,rgba(255,255,255,0.3)), 
            color-stop(100%,rgba(255,255,255,0.2))),
        
        /* dark outside gradient */
        -webkit-gradient(
            linear, 
            left top, 
            right top, 
            color-stop(0%,rgba(210,210,210,0.3)), 
            color-stop(20%,rgba(210,210,210,0)), 
            color-stop(80%,rgba(210,210,210,0)), 
            color-stop(100%,rgba(210,210,210,0.3))),
        
        /* light inner gradient */
        -webkit-gradient(
            linear, 
            left top, 
            right top, 
           ...