.lds-dual-ring {
    position: fixed;
    z-index: 9999;
    left: 50%;
    top: 50%;
    display: none;
}

.lds-dual-ring:after {
    content: "";
    display: block;
    width: 128px;
    height: 128px;
    margin: -64px;
    border-radius: 50%;
    border: 12px solid #00643c;
    border-color: #00643c transparent #00643c transparent;
    animation: lds-dual-ring 1.2s linear infinite;
}
@keyframes lds-dual-ring {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}