.loader-wrapper {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: .4;
}

.lds-ripple {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
}

    .lds-ripple div {
        position: absolute;
        border: 4px solid #515151;
        opacity: 1;
        border-radius: 50%;
        animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
    }

        .lds-ripple div:nth-child(2) {
            animation-delay: -0.5s;
        }

@keyframes lds-ripple {
    0% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 1;
    }

    100% {
        top: 0px;
        left: 0px;
        width: 72px;
        height: 72px;
        opacity: 0;
    }
}