#loadingOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.4);
    /* nền tối */
    z-index: 9999;
    display: none;
}

#loading {
    width: 48px;
    height: 48px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 3px solid;
    border-color: #fff #fff transparent transparent;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
}

#loading::after,
#loading::before {
    content: "";
    box-sizing: border-box;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    border: 3px solid;
    border-color: transparent transparent #ff3d00 #ff3d00;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    animation: rotationBack 0.5s linear infinite;
    transform-origin: center center;
}

#loading::before {
    width: 32px;
    height: 32px;
    border-color: #fff #fff transparent transparent;
    animation: rotation 1.5s linear infinite;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

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

@keyframes rotationBack {
    0% {
        transform: rotate(0deg);
    }

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