.loading {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.1); 
        display: flex;
        justify-content: center;
        align-items: center;
        z-index: 9999;
        transition: 1s all;
        opacity: 0;
    }
    .loading.show {
        opacity: 1;
    }