version.css

.main{
    width: 10rem;
    height: 56.093rem;
    background: url(../../img/updateBg.png) no-repeat;
    background-size: 100% 100%;
    margin: 0 auto;
    position: relative;
}

.updateBtn{
    width: 7.44rem;
    height: 1.36rem;
    background: url(../../img/updateBtn.png) no-repeat;
    background-size: 100% 100%;
    position: absolute;
    top: 9.5rem;
    left: 50%;
    margin-left: -3.72rem;
    animation: flash 1.5s linear infinite;
}

@keyframes flash {
    0%{
        opacity: 0.5;
    }
    100%{
        opacity: 1;
    }
    0%{
        transform: scale(0.5);
    }
    100%{
        transform: scale(1);
    }
}