SOURCE

<div style="padding: 50px; text-align: center;">
    <i class="icon-focus"></i>
</div>

.icon-focus {
    width: 12px;
    height: 12px;
    display: inline-block;
    border-radius: 8px;
    background: red;
    position: relative;
    overflow: visible;
}
.icon-focus:before,
.icon-focus:after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 14px;
    height: 14px;
    margin: -7px 0 0 -7px;
    border-radius: 10px;
    border: 1px solid red;
    box-sizing: border-box;
    animation: zoom 2s infinite;
}
.icon-focus:after {
    animation-delay: .6s;
}

@keyframes zoom {
    80% {
        opacity: 0;
        transform: scale(2);
    }
    100% {
        opacity: 0;
        transform: scale(1);
    }
}