You can simply change layout mode to Light by doing the below changes in the file views/partials/main.ejs.

Simply replace the attribute data-layout-mode="light" data-sidebar="light" data-topbar="laight" data-bs-theme="light" data-sidebar-size="lg" data-preloader="disable" to the html tag. It will update the layout mode to Light mode. No need to change any css or js files.