.gradient-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2rem;
  z-index: 99;
  pointer-events: none;
  background-color: var(--bg);
  backdrop-filter: blur(1px);
  mask-image: linear-gradient(
    to bottom,
    black 0%,
    rgba(0, 0, 0, 0.738) 19%,
    rgba(0, 0, 0, 0.541) 34%,
    rgba(0, 0, 0, 0.382) 47%,
    rgba(0, 0, 0, 0.278) 56.5%,
    rgba(0, 0, 0, 0.194) 65%,
    rgba(0, 0, 0, 0.126) 73%,
    rgba(0, 0, 0, 0.075) 80.2%,
    rgba(0, 0, 0, 0.042) 86.1%,
    rgba(0, 0, 0, 0.021) 91%,
    rgba(0, 0, 0, 0.008) 95.2%,
    rgba(0, 0, 0, 0.002) 98.2%,
    transparent 100%
  );
  -webkit-mask-image: linear-gradient(
    to bottom,
    black 0%,
    rgba(0, 0, 0, 0.738) 19%,
    rgba(0, 0, 0, 0.541) 34%,
    rgba(0, 0, 0, 0.382) 47%,
    rgba(0, 0, 0, 0.278) 56.5%,
    rgba(0, 0, 0, 0.194) 65%,
    rgba(0, 0, 0, 0.126) 73%,
    rgba(0, 0, 0, 0.075) 80.2%,
    rgba(0, 0, 0, 0.042) 86.1%,
    rgba(0, 0, 0, 0.021) 91%,
    rgba(0, 0, 0, 0.008) 95.2%,
    rgba(0, 0, 0, 0.002) 98.2%,
    transparent 100%
  );
  opacity: 0;
  transition: background-color 0.2s ease-out;
}

@media (min-width: 768px) {
  .gradient-mask {
    height: 4rem;
  }
}