틀:1961 툴팁/styles.css

.a {
  display: inline-block;
  color: #fff;
  font-weight: bold;
}
.b {
  display: none;
  position: absolute;
  max-width: 200px;
  border: 1px solid #dd0000;
  border-radius: 5px;
  padding: 5px;
  font-size: 0.8em;
  color: white;
  background: #222;
}
.a:hover .b {
  display: block;
}