Why doesn't the menu shadow go to the background?

Question

css

Good time of the day! I don’t understand why the shadow doesn’t want to go to the background, z-index: -1, what’s wrong? Here is a link to the layout https://ratibor1978.github.io/clinic-paracelsus/

Answer 1

I didn’t go deep ... you yourself will figure it out already there ....

.header__nav-items {
  -webkit-border-radius: 14px;
  border-radius: 14px;
  border: 1px solid #e4e7e6;
  /* position: relative; */
  }