body header {
  top: 0;
  position: sticky;
  z-index: 100;
  height: 75px;
}

body header nav {
  width: 90%;
  max-width: 1100px;
  margin: auto;
  height: 75px;
  align-content: center;
  border-radius: 0 0 15px 15px;
  background-color: rgba(255, 255, 255, 0.70);
  backdrop-filter: blur(8px);
  transition: height 1s ease;
  overflow: hidden;
}

body header nav a,
body header nav button {
  float: left;
  display: inline;
  height: 50px;
  margin: 10px;
  align-content: center;
}

header nav a,
header nav button {
  position: relative;
  text-decoration: none;
}

header nav a::after,
header nav button::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  color: var(--JaBuvo3);

  width: 0;
  height: 2px;
  background-color: currentColor;

  transition: width 0.3s ease;
}

header nav a:hover::after,
header nav button:hover::after {
  width: 100%;
}

header nav button {
  display: none;
  aspect-ratio: 1/1;
  border: none;
  background: none;
  font-size: xx-large;
}

body header nav a img {
  height: inherit;
}

#menuKnop {
  position: absolute;
  left: 15px;
  top: 15px;
  height: 50px;
  width: 50px;
  background: none;
  border: none;
  font-size: xx-large;
}