#loader{
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    position: absolute;
    top: 0;
    left: 0;
}
.loader,
.loader div {
    box-sizing: border-box;
}
.loader {
    display: inline-block;
    position: absolute;
    width: 80px;
    height: 80px;
    z-index: 2;
    top: calc(50% - 40px);
    left: calc(50% - 40px);
}
.loader div {
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: currentColor;
    animation: lds-grid 1.2s linear infinite;
}
.loader div:nth-child(1) {
    top: 8px;
    left: 8px;
    animation-delay: 0s;
}
.loader div:nth-child(2) {
    top: 8px;
    left: 32px;
    animation-delay: -0.4s;
}
.loader div:nth-child(3) {
    top: 8px;
    left: 56px;
    animation-delay: -0.8s;
}
.loader div:nth-child(4) {
    top: 32px;
    left: 8px;
    animation-delay: -0.4s;
}
.loader div:nth-child(5) {
    top: 32px;
    left: 32px;
    animation-delay: -0.8s;
}
.loader div:nth-child(6) {
    top: 32px;
    left: 56px;
    animation-delay: -1.2s;
}
.loader div:nth-child(7) {
    top: 56px;
    left: 8px;
    animation-delay: -0.8s;
}
.loader div:nth-child(8) {
    top: 56px;
    left: 32px;
    animation-delay: -1.2s;
}
.loader div:nth-child(9) {
    top: 56px;
    left: 56px;
    animation-delay: -1.6s;
}
@keyframes lds-grid {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}