sweetalert.

go to :

https://sweetalert.js.org/guides/

Do this

from django.contrib import messages

def detail(request, movie_id):
    movie=Movie.objects.get(id=movie_id)
    if request.method=='POST':
        movie=Movie.objects.get(id=movie_id)
        movie.delete()
        messages.success(request, 'Movie deleted successfully !')
        return redirect('/')
    return render(request, "detail.html", {'movie': movie})

add this code to redirected page!

index.html

               <!--    sweetalert    -->

            <script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
            <script>
            {% for msg in messages %}
                swal("Good job!", "{{msg}}", "success");
            {% endfor %}
            </script>