.loader {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: #fff;
    box-shadow: 32px 0 #fff, -32px 0 #fff;
    position: relative;
    animation: flash 0.5s ease-out infinite alternate;
}

@keyframes flash {
    0% {
        background-color: #FFF2;
        box-shadow: 32px 0 #FFF2, -32px 0 #FFF;
    }

    50% {
        background-color: #FFF;
        box-shadow: 32px 0 #FFF2, -32px 0 #FFF2;
    }

    100% {
        background-color: #FFF2;
        box-shadow: 32px 0 #FFF, -32px 0 #FFF2;
    }
}