.app-preloader {
    position:fixed;
    top:0;
    left:0;
    width:0;
    height:5px;
    background-color: var(--bs-primary);
    animation: pre-loader 2s infinite;
}

@keyframes pre-loader {
    0%{
        width: 0;
    }
    100%{
        width: 100%
    }
}