body {
  margin-top: 40px;
/* user-select: none;*/
}
nav {
  width: 100%;
  position: absolute;
  top: 0;
  margin-left: -8px;
  font-family: sans-serif;
}
nav ul {
  display: flex;
  white-space: nowrap;
  top: 0;
  margin: 0;
  padding: 0;
  background: yellow;
}
nav li {
  display: inline-block;
}
nav div {
  position: absolute;
  margin-top: 3px;
  display: none;
  box-shadow: 0 4px 5px 3px rgb(0 0 0 / 20%);
}
nav a {
  display: block;
  text-decoration: none;
  border-bottom: 1px dotted gray;
}
nav a:last-child {
  border-bottom: none;
}
nav a:visited {
  color: purple;
}
nav li, nav a {
  text-align: left;
  font-size: initial;
  background: yellow;
  color: blue;
  width: initial;
  padding: 8px 10px;
  margin: 0;
}
nav li:hover, nav a:hover {
  background: blue;
  color: yellow;
}