body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, sienna, maroon);
}

.loader {
    width: 6em;
    height: 1em;
    font-size: 20px;
    position: relative;
    --duration: 2s;
    --dots: 5;
}

.loader span {
    position: absolute;
    width: 1em;
    height: 1em;
    background-color: white;
    border-radius: 50%;
    top: 0;
    left: 5em;
    animation: var(--duration) linear infinite;
    animation-name: walk, jump, squash;
    animation-delay: calc(var(--n) * var(--duration) / var(--dots) * -1);
}

@keyframes walk {
    0%, 95%, 100% {
        left: 5em;
    }

    80%, 85% {
        left: 0;
    }
}

@keyframes jump {
    80%, 100% {
        top: 0;
    }

    85%, 95% {
        top: -1em;
    }
}

@keyframes squash {
    80%, 100% {
        width: 1em;
        height: 1em;
    }

    90% {
        width: 1.5em;
        height: 0.8em;
    }
}

.loader span:nth-child(1) {
    --n: 1;
}

.loader span:nth-child(2) {
    --n: 2;
}

.loader span:nth-child(3) {
    --n: 3;
}

.loader span:nth-child(4) {
    --n: 4;
}

.loader span:nth-child(5) {
    --n: 5;
}