/* HTML: <div class="loader"></div> */
.loading-circle {
    display: inline-block;
    width: 16px;
    aspect-ratio: 1;
    border-radius: 50%;
    border: 2px solid;
    border-color: #2ecc71 #0000;
    animation: l1 0.5s infinite;
}

@keyframes l1 {
    to {
        transform: rotate(.5turn)
    }
}

/* HTML: <div class="loading-horizontal-circle"></div> */

.loading-horizontal-circle {
    display: inline-block;
    width: 30px;
    height: 16px;
    aspect-ratio: 2;
    --_g: no-repeat radial-gradient(circle closest-side, #2ecc71 90%, #0000);
    background:
        var(--_g) 0% 50%,
        var(--_g) 50% 50%,
        var(--_g) 100% 50%;
    background-size: calc(100%/4) 50%;
    animation: l3 1s infinite linear;
}

@keyframes l3 {
    20% {
        background-position: 0% 0%, 50% 50%, 100% 50%
    }

    40% {
        background-position: 0% 100%, 50% 0%, 100% 50%
    }

    60% {
        background-position: 0% 50%, 50% 100%, 100% 0%
    }

    80% {
        background-position: 0% 50%, 50% 50%, 100% 100%
    }
}