#kt_app_content{
    background-size:cover;
    transition: opacity 0.5s ease-in-out;
}

html[data-bs-theme='light']  #kt_app_content {
    background-image: linear-gradient(to bottom, transparent, rgba(256, 256, 256, 0.4)), url('/media/CoreCms/white-bg.jpg');
}


html[data-bs-theme='dark'] #kt_app_content {
    background-color: rgba(0, 0, 0, 0.5);
    background-image: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.6)), url('/media/CoreCms/Layer 0.png');
    background-size: cover;
}