Answers for "appear element css"

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>

hover over something to make html visible

div {
    display: none;
}
    
a:hover + div {
    display: block;
}