body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: beige;
}

.loader {
    font-size: 10px;
    width: 12em;
    padding: 0 4em 2em 4em;
    color: black;
    border-style: solid;
    border-width: 0.4em 0.1em 4em 0.1em;
    display: flex;
    justify-content: space-between;
}

.loader span {
    width: 0.2em;
    height: 10em;
    background-color: currentColor;
    position: relative;
    transform-origin: top;
    animation: moving-up 0.75s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes moving-up {
    0%, 50% {transform: rotate(0deg);}
    100% {transform: rotate(calc(45deg * var(--direction)));}
}

.loader span::before {
    content: '';
    position: absolute;
    width: 3em;
    height: 3em;
    background-color: inherit;
    border-radius: 50%;
    bottom: 0;
    left: -1.5em;
}

.loader span:first-child {--direction: 1; animation-direction: alternate;}
.loader span:last-child {--direction: -1; animation-direction: alternate-reverse;}