Dismiss Modal with animation

I have a button on my modal and I want to dismiss the modal with animation. Right now it just closes it.

HStack {
            Spacer()
            Image(systemName: "xmark")
              .font(.system(size: 16, weight: .medium))
              .foregroundColor(.white)
              .frame(width: 36, height: 36)
              .background(Color.black)
              .clipShape(Circle())
               
              .onTapGesture {
                self.showModal.toggle() --> HERE
              }
             
          }

How can I do that ?
Thx