功能

.countDown {
    top: 0;
    width: 250px;
    height: 30px;
    line-height: 30px;
    color: #bfe2ff;
    font-size: 14px;
    letter-spacing: 1px;
    background: rgba(0, 49, 161, 0.52);
    box-shadow: 0 0 10px #0078ff;
    border-radius: 8px;
    animation: glow 1200ms ease-out infinite alternate;
    /* Safari 与 Chrome */
}
@keyframes glow {
    0% {
        border-color: #393;
        box-shadow: 0 0 5px rgba(0, 255, 0, .1), inset 0 0 5px rgba(0, 255, 0, .1), 0 0px 0 #393;
    }
    
    100% {
        border-color: #393;
        box-shadow: 0 0 20px rgba(0, 255, 0, .5), inset 0 0 10px rgba(0, 255, 0, .2), 0 0 0 #393;
    }
}