Hide sibling div on hover with css only

Question

I am interested in a way of making CSS(no javascript) show off a div or an element outside of the one you :hover, like so:

#divid {
  display: none;
}
a:hover #divid {
  display: block;
}

<a href="#">Hover me!</a>
<div id="divid">Hello there, fellow friend!</div>

I am pretty curious, because I want to make a thing while you hover a certain menu element, you will get the search bar drawn to the left edge of the browser(it'll be position: fixed;).

---

EDIT:

The above code was not actually whatI wanted, I think.

This is the actual code, since it doesn't work anyways by the answers.

#fixed2 a:hover + .nav {
  background: black;
}
#options:hover + #search_text {
  position: fixed;
  top: 0;
  left: 0;
}

<ul class="nav">
  <li id="left" class="big">
    <a href="#">
      <img width="35px" src="square.png" />
    </a>
  </li>
  <li id="left" class="arrow">
    <a href="#">
      <img src="arrow.png" />
    </a>
  </li>
  <li id="left">
    <a href="#">
      <img width="17px" style="margin-left: -7px" src="refresh.png" />
    </a>
  </li>
  <li id="left">
    <a href="#">
      <img width="18px" style="opacity: 0.94; margin-top: -1px;" src="help.png" />
    </a>
  </li>
  <div id="fixed">
    <li id="search">
      <form action="" method="get">
        <input type="text" name="search_text" id="search_text" placeholder="Search" />
        <input type="button" name="search_button" id="search_button">
      </form>
    </li>
  </div>
  <div id="fixed2">
    <li class="icn" id="options">
      <a href="#">
        <img width="25px" src="settings.png" />
      </a>
    </li>
  </div>
</ul>

Why doesn't it work properly and just actually work?

Answer 1

UPDATE you can't achieve what you want in CSS with your current markup, because CSS doesn't have a parent CSS selector, check Is there a CSS parent selector?, So two options:

• Do this via JS
• Change your current markup in the way the element which is going to hover and be hovered are siblings (like your previous example and my answer below)

---

you can use the adjacent sibling selector +

#divid {
  display: none;
}
a:hover + #divid {
  display: block;
}

<a href="#">Hover me!</a>
<div id="divid">Hello there, fellow friend!</div>

if you have an extra siblings between them you can use the general sibling selector ~ which is less strict

#divid {
  display: none;
}
a:hover ~ #divid {
  display: block;
}

<a href="#">Hover me!</a>
<div id="sibling">I'm sibling too</div>
<div id="divid">Hello there, fellow friend!</div>