show a hidden when hover css code example
Example 1: hover over something to make html visible
div {
display: none;
}
a:hover + div {
display: block;
}
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>