:root {
  --txtCol: #fff;
  --bgCol: #151016;
}

.hide {
  visibility: hidden;
  
  /* Looks */
  width: auto;
  width: 300px;
  color: var(--txtCol);
  background-color: var(--bgCol);
  
  /* Position */
  position: absolute;
  top: 70%;
  left: 50%;
}

.extra {
  position: relative;
  font-weight: bold;
}

.extra:hover .hide {
  visibility: visible;
  font-weight: lighter;
}