I can't align the menu items to the right

Hello I have a little problem with my menu tags but I couldn’t solve it, can somebody help me? I had already align my logo and product title (Professional Blues Harmonica Lessons) to the left. But I can’t align the menu tags to the right. I tried the margin-right: 0px; code but it doesn’t work and I don’t know why.
My product page link is here.

One solution would be to add this to CSS:

.nav {
  display: flex;
  justify-content: flex-end;
  flex: 1;
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