CSS实现简单动态渐变闪烁效果

CSS练习用例：

.event {
    border-radius:4px;
    -webkit-border-radius:4px;
    color:#FFFFFF;
    font-size:12px;
    margin:0px 30px;
    padding:2px 0px;
}

.event.received {
    background-color:#4B946A;
    display:none;
}

@keyframes fade {
    from { opacity: 1.0; }
    50% { opacity: 0.4; }
    to { opacity: 1.0; }
}
 
@-webkit-keyframes fade {
    from { opacity: 1.0; }
    50% { opacity: 0.4; }
    to { opacity: 1.0; }
}
 
.blink {
    animation:fade 3000ms infinite;
    -webkit-animation:fade 3000ms infinite;
}

<div id="deviceready" class="blink">
     <p class="event received">Device is Ready</p>
</div>