call another div on mouse hover code example

Example 1: make action on hover on other element

#container:hover #cube {
    background-color: yellow;   
}

Example 2: on hover display another div css

.showme {
  display: none;
}

.showhim:hover .showme {
  display: block;
}


<div class="showhim">HOVER ME
  <div class="showme">hai</div>
</div>