I cannot make my hover class works. How can I make it work?

Question

This is my html code, and the lower one is css code. I really need help :( :hover class does not work at all. Did I code something wrong?

html {
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: black;
}

.nav_bar>li {
  padding: 20px;
  flex-basis: 0;
  flex-grow: 1;
  background-color: #ffffa8;
  height: 1rem;
  text-align: center;
  flex-direction: column;
}

#Homesub {
  display: none;
}

#Home:hover #Homesub {
  display: list-item;
}

<nav>
  <ul class="nav_bar">
    <li>
      <a href="Hme.html" id="Home">Home</a>
      <ul class="sub">
        <li><a href="Members.html" id="Homesub">Members</a></li>
      </ul>
    </li>
  </ul>
</nav>

Answer 1

You are targeting the anchor, not the li

Seems like you should be targeting the ul.

html {
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: black;
}

.nav_bar>li {
  padding: 20px;
  flex-basis: 0;
  flex-grow: 1;
  background-color: #ffffa8;
  height: 1rem;
  text-align: center;
  flex-direction: column;
}

li > ul {
  display: none;
}

li:hover > ul {
  display: block;
}

<nav>
  <ul class="nav_bar">
    <li>
      <a href="Hme.html" id="Home">Home</a>
      <ul class="sub">
        <li><a href="Members.html" id="Homesub">Members</a></li>
      </ul>
    </li>
  </ul>
</nav>