.lds-dual-ring {
    width: 80px;
    height: 80px;
    display: none;
    z-index: 999;
    position: fixed;
    overflow: visible;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

.lds-dual-ring:before {
    content: '';
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.3);
}

.lds-dual-ring:after {
    content: " ";
    display: block;
    width: 80px;
    height: 80px;
    margin: 0px;
    border-radius: 60%;
    border: 6px solid olive;
    border-color: #1e7e34 transparent #1e7e34 transparent;
    animation: lds-dual-ring 1.0s linear infinite;
}

@keyframes lds-dual-ring {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}