css按钮动画

@keyframes myfirst
{
    from {background: red;}
    to {background: yellow;}
}
 
@-webkit-keyframes myfirst /* Safari 与 Chrome */
{
    from {background: red;}
    to {background: yellow;}
}

转自：CSS3 动画 | 菜鸟教程 (runoob.com)