.cont{
  border: 2px dashed gray;
  display: none;
  padding: 10px;
}

.expand.cont{
  display: block;
}

.but{
  color: #000;
  background: transparent;
}
.but:hover, .but:focus{
  text-decoration: underline;
  outline: 0;
  color: #000;
  background: transparent;
}