<nav>
  <ul>
    <li><a href="#">Home</a></li>
    <li><button>User</button>
      <ul>
        <li><a href="#">Profile</a></li>
        <li><a href="#">Settings</a></li>
        <li><a href="#">Sign out</a></li>
    </li>
  </ul>
  </li>
  </ul>
</nav>
a {
  transition: all 250ms cubic-bezier(.33,.65,.67,.81);
}
nav {
  background-color: #007bff;
  padding: 1em;
}
nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
nav > ul {
  display: flex;
  gap: 1em;
}
nav > ul > li {
  position: relative;
}
nav > ul > li a,
nav > ul > li button {
  padding: 0;
  border: none;
  background: none;
  text-decoration: none;
  color: #fff;
  font-size: 1em;
  line-height: inherit;
}
nav > ul > li a:hover,
nav > ul > li button:hover {
  cursor: pointer;
  font-weight: bold;
}

nav > ul ul {
  position: absolute;
  background-color: #007bff;
  padding: 1em;
  opacity: 0;
  visibility: hidden;
  translate: 0 25%;
  transition: all 250ms cubic-bezier(.33,.65,.67,.81);
  transition-delay: 300ms;
}
nav ul > li:hover > ul,
nav ul > li:focus-within > ul {
  opacity: 1;
  visibility: visible;
  translate: 0 0;
}

External CSS

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External JavaScript

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