can you control another div on hover css

1#a:hover + #b {
2    background: #ccc
3}
4
5<div id="a">Div A</div>
6<div id="b">Div B</div>

1.showme {
2  display: none;
3}
4
5.showhim:hover .showme {
6  display: block;
7}
8
9
10<div class="showhim">HOVER ME
11  <div class="showme">hai</div>
12</div>

1#a:hover ~ #b {
2    background: #ccc
3}
4
5<div id="a">Div A</div>
6<div>random other elements</div>
7<div>random other elements</div>
8<div>random other elements</div>
9<div id="b">Div B</div>
10