A Simple and Lightweight CSS Loading Animation

/* Big Loading Animation */

#bigLoadingOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

#loadingSpinner {
    width: 150px;
    height: 150px;
    border: 10px solid #fff;
    border-top: 10px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* small loading animation */
.loader {
    width: 20px;
    aspect-ratio: 1;
    border-radius: 50%;
    background: radial-gradient(farthest-side,#ffa516 94%,#0000) top/8px 8px no-repeat, conic-gradient(#0000 30%,#ffa516);
    -webkit-mask: radial-gradient(farthest-side,#0000 calc(100% - 8px),#000 0);
    animation: l13 1s infinite linear;
}

@keyframes l13 {
    100% {
        transform: rotate(1turn)
    }
}

function showSmallLoading(containerid) {
    document.getElementById(containerid).classList.add("loader");
    document.getElementById(containerid).style.display = "block";
}

function closeSmallLoading(containerid) {
    try {
        document.getElementById(containerid).style.display = "none";
    }
    catch (err) {
        console.log(err);
    }
}

function showBigLoading() {
    // Create the overlay div
    const overlay = document.createElement('div');
    overlay.id = 'bigLoadingOverlay';

    // Create the spinner
    const spinner = document.createElement('div');
    spinner.id = 'loadingSpinner';

    // Append spinner to overlay
    overlay.appendChild(spinner);

    // Add to document body
    document.body.appendChild(overlay);

    // Add click event listener to close when clicked
    overlay.addEventListener('click', closeBigLoading);
}

function closeBigLoading() {
    const overlay = document.getElementById('bigLoadingOverlay');
    if (overlay) {
        overlay.remove();
    }
}

<span id="spanLoading"></span>

<script>
  showBigLoading();
  showLoading('spanLoading');
  closeLoading('spanLoading');
</script>

<button type="button" onclick="showBigLoading();">Show Big Loading</button>
<button type="button" onclick="showSmallLoading('spanLoading');">Show Small Loading</button>
<button type="button" onclick="closeSmallLoading('spanLoading');">Close Small Loading</button>