@keyframes blink
{
    from {
        opacity:0.25;
    }
    to{
        opacity:1;
    }
}

.blink{
    animation: blink;
    animation-duration: 2s;
    animation-timing-function: cubic-bezier(0,0,0.58,1);
    animation-direction: alternate;
    animation-play-state: running;
    animation-iteration-count: infinite;
}