/* HTML: <div class="loader"></div> */
.loader {
    margin: 20px 0px;
    width: 65px;
    aspect-ratio: 1;
    position: relative;
}

.loader:before,
.loader:after {
    content: "";
    position: absolute;
    border-radius: 50px;
    box-shadow: 0 0 0 3px inset #fff;
    animation: l4 2.5s infinite;
}

.loader:after {
    animation-delay: -1.25s;
}

@keyframes l4 {
    0% {
        inset: 0 35px 35px 0;
    }

    12.5% {
        inset: 0 35px 0 0;
    }

    25% {
        inset: 35px 35px 0 0;
    }

    37.5% {
        inset: 35px 0 0 0;
    }

    50% {
        inset: 35px 0 0 35px;
    }

    62.5% {
        inset: 0 0 0 35px;
    }

    75% {
        inset: 0 0 35px 35px;
    }

    87.5% {
        inset: 0 0 35px 0;
    }

    100% {
        inset: 0 35px 35px 0;
    }
}