.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0); /* fully transparent */
    z-index: 9999;
}

.loader {
    width: 100px;
    height: 100px;
    position: absolute;
    top: 50%;
    left: 50%;
}
    .loader span {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        transform: rotate(calc(18deg * var(--i)));
    }

        .loader span::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 15px;
            height: 15px;
            background: #18598c;
            border-radius: 50%;
            transform: scale(0);
            animation: animate 2s linear infinite;
            animation-delay: calc(0.1s * var(--i));
        }

@keyframes animate {
    0% {
        transform: scale(0);
    }

    10% {
        transform: scale(1.2);
    }

    80%,100% {
        transform: scale(0);
    }
}