CSS3 click button to achieve background gradient animation effect

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<meta>
<meta>
<title>css3给按钮添加背景渐变动画</title>
<!--
@author：SM
@email:sm0210@qq.com
@desc：
css3给按钮添加背景渐变动画
-->
<style>
button {
color:#FFF;
font-size:16px;
outline:none;
width:300px;
height:48px;
background:#26A1D9;
border:none;
-webkit-border-radius:5px;
border-radius:5px;
}
button:active{
outline:none;
background:#208FC1;
/*执行动画*/
-webkit-animation:showBtn 0.5s 1;
animation:showBtn 0.5s 1;
/*停止在最后一帧*/
-webkit-animation-fill-mode:forwards;
animation-fill-mode:forwards;
}
/*
定义动画
*/
@-webkit-keyframes showBtn{ <p>10%{
background:-webkit-radial-gradient(Circle,#1E7AA5 28%, #2287B7 30%, #2287B7 48%,#208FC1 60%); 
background:radial-gradient(Circle,#1E7AA5 28%, #2287B7 30%, #2287B7 48%,#208FC1 60%); 
} <p>20%{
background:-webkit-radial-gradient(Circle,#1E7AA5 32%, #2287B7 34%, #2287B7 52%,#208FC1 60%);
background:radial-gradient(Circle,#1E7AA5 32%, #2287B7 34%, #2287B7 52%,#208FC1 60%); 
} <p>40%{
background:-webkit-radial-gradient(Circle,#1E7AA5 34%, #2287B7 36%, #2287B7 54%,#208FC1 60%);
background:radial-gradient(Circle,#1E7AA5 34%, #2287B7 36%, #2287B7 54%,#208FC1 60%);
} <p>60%{
background:-webkit-radial-gradient(Circle,#1E7AA5 36%, #2287B7 38%, #2287B7 56%,#208FC1 60%);
background:radial-gradient(Circle,#1E7AA5 36%, #2287B7 38%, #2287B7 56%,#208FC1 60%);
} <p>80%{
background:-webkit-radial-gradient(Circle,#1E7AA5 38%, #2287B7 40%, #2287B7 58%,#208FC1 60%);
background:radial-gradient(Circle,#1E7AA5 38%, #2287B7 40%, #2287B7 58%,#208FC1 60%);
} <p>100%{
background:-webkit-radial-gradient(Circle,#1E7AA5 40%, #2287B7 42%, #2287B7 60%,#208FC1 60%);
background:radial-gradient(Circle,#1E7AA5 40%, #2287B7 42%, #2287B7 60%,#208FC1 60%);
}
}
</style>


<button>按钮</button> <p>
</p>