*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.parent{
    filter: contrast(30);
    background-color: #fff;
}

.circle{
    display: inline-block;
    width: 100px;
    height: 100px;
    background-color: #20201e;
    clip-path: circle(50% at 50% 50%);
    margin: 1em;
    filter: blur(20);
}

.circle:first-child{
    animation: mov 2s alternate infinite;
}


@keyframes mov{
    0%{
        transform: translate(0px);
    }

    100%{
        transform: translate(130px);
    }
}