.newtons-cradle {
    --uib-size: 50px;
    --uib-speed: 1.2s;
    --uib-color: #474554;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--uib-size);
    height: var(--uib-size);
}

.newtons-cradle__dot {
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
    width: 25%;
    transform-origin: center top;
}

    .newtons-cradle__dot::after {
        content: '';
        display: block;
        width: 100%;
        height: 25%;
        border-radius: 50%;
        background-color: var(--uib-color);
    }

    .newtons-cradle__dot:first-child {
        animation: swing var(--uib-speed) linear infinite;
    }

    .newtons-cradle__dot:last-child {
        animation: swing2 var(--uib-speed) linear infinite;
    }

@keyframes swing {
    0% {
        transform: rotate(0deg);
        animation-timing-function: ease-out;
    }

    25% {
        transform: rotate(70deg);
        animation-timing-function: ease-in;
    }

    50% {
        transform: rotate(0deg);
        animation-timing-function: linear;
    }
}

@keyframes swing2 {
    0% {
        transform: rotate(0deg);
        animation-timing-function: linear;
    }

    50% {
        transform: rotate(0deg);
        animation-timing-function: ease-out;
    }

    75% {
        transform: rotate(-70deg);
        animation-timing-function: ease-in;
    }
}