Html - CSS z-index positioning?

I am trying to figure out why my overlay (in the @media (min-width: 768px)) is not under my navbar, altho my z-index should indicate that it sets under it. and outside the @media (when in small screen) it's working just perfectly and it's indeed under navbar-items.

I have tried tinkering around with z-index alot but i can seem to get it to go under the navbar and keep the navbar the top div to show.

.navbar {
  width: 100%;
  height: 70px;
  background-color: #3f4d67;
  padding: 0 20px;
  color: #fff;
}

.navbar-items {
  position: fixed;
  top: 0;
  left: -100%;
  width: 264px;
  height: 100vh;
  background-color: #3f4d67;
  color: #fff;
  transition: left 0.4s ease-in-out;
  z-index: 1000;
}

.navbar-items.open {
  transform: translateY(0);
  left: 0;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.2);
  display: none;
  z-index: 10;
  pointer-events: none;
}

.overlay.open {
  display: block;
  pointer-events: all;
}
.logo-navicon {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  height: 70px;
  align-items: center;
}
.logo-img {
  width: 35px;
  height: 35px;
}
.logo-container {
  display: flex;
  align-items: center;

  width: 100%;
}
.nav-icon {
  width: 20px; /* Adjust the width */
  height: 15px; /* Adjust the height */
  position: relative;
  transform: rotate(0deg);
  transition: 0.5s ease-in-out;
  cursor: pointer;
}
.big-screen-nav-icon {
  display: none;
}
.nav-icon span {
  display: block;
  position: absolute;
  height: 3px; /* Adjust the height */
  width: 100%;
  background: #a9b7d0;
  border-radius: 3px; /* Adjust the border radius */
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: 0.25s ease-in-out;
}

.nav-icon span:nth-child(1) {
  top: 0px;
}

.nav-icon span:nth-child(2),
.nav-icon span:nth-child(3) {
  top: 5px; /* Adjust the top position */
}

.nav-icon span:nth-child(3) {
  top: 10px; /* Adjust the top position */
}

.nav-icon.open span:nth-child(1) {
  top: 5px; /* Adjust the top position */
  transform: rotate(135deg);
}

.nav-icon.open span:nth-child(2) {
  opacity: 0;
  left: -20px; /* Adjust the left position */
}

.nav-icon.open span:nth-child(3) {
  top: 5px; /* Adjust the top position */
  transform: rotate(-135deg);
}
@media (min-width: 768px) {
  .navbar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 264px; /* Adjust the width as needed */
    background-color: #3f4d67; /* Example background color */
    z-index: 1000; /* Ensure the navbar is on top of other content */
    height: 100vh;
    transition: width 0.4s ease;
    box-shadow: 1px 0 20px 0 #3f4d67;
  }
  .navbar-items {
    position: initial;
    width: 100%;
    height: initial;
    background-color: #3f4d67;
    color: #fff;
    transition: left 0.4s ease-in-out;
    display: block;
  }

  .small-screen-nav-icon {
    display: none;
  }
  .big-screen-nav-icon {
    display: block;
  }
  .navbar.collapsed {
    width: 80px;
  }
  .navbar.collapsed:hover {
    width: 264px;
  }
  .navbar.collapsed:hover .overlay {
    display: block;
  }
}