.lds-dual-ring {
    width: 100%;
    height: 32px;
    position: relative;
}

    .lds-dual-ring:after {
        content: " ";
        display: block;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        border: 3px solid dimgrey;
        border-color: dimgrey transparent dimgrey transparent;
        animation: lds-dual-ring 1.2s linear infinite;
        position: absolute;
        margin: auto;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
    }

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

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