CSS3 简写animation

@-webkit-keyframes 'buttonLight' {
%,50%,100% { opacity:1;}
%,75%{ opacity:0;}
}
a.flash{
-webkit-animation-name: "buttonLight"; /*动画名称，需要跟@keyframes定义的名称一致*/
-webkit-animation-duration: 5s;/*动画持续的时间长*/
}
a#btn {
/*按钮的基本属性*/
background: #60cb1b;
font-size: 16px;
padding: 10px 15px;
color: #fff;
text-align: center;
text-decoration: none;
font-weight: bold;
text-shadow: 0 -1px 1px rgba(0,0,0,0.3);
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
border-radius: 5px;
-moz-box-shadow: 0 0 5px rgba(255, 255, 255, 0.6) inset, 0 0 3px rgba(220, 120, 200, 0.8);
-webkit-box-shadow: 0 0 5px rgba(255, 255, 255, 0.6) inset, 0 0 3px rgba(220, 120, 200, 0.8);
box-shadow: 0 0 5px rgba(255, 255, 255, 0.6) inset, 0 0 3px rgba(220, 120, 200, 0.8);
}

<a href="" id="btn" class="flash">button</a>