.spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    height: 56px;
    width: 56px;
    box-sizing: border-box;
    background: conic-gradient( from 90deg at 50% 50%, rgba(39, 174, 96, 0) 0deg, rgb(0, 0, 0) 0.09deg, #808080 360deg );
    border-radius: 56px;
    /* previous code */
    animation: 1s rotate infinite linear;
}

    .spinner::before {
        content: "";
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        height: 40px;
        width: 40px;
        background: #fff;
        border-radius: 48px;
    }

    .spinner::after {
        content: "";
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        height: 8px;
        width: 8px;
        background: #808080;
        border-radius: 8px;
    }

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

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