.xxxc {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}
.xxxc .btn-primary {
  background-color: #222;
  color: white;
  border: 0;
  padding: 1rem 2rem;
  font-size: 2rem;
  text-align: left;
  border-radius: 0rem;
}
.xxxc .btn-primary .icon {
  display: none;
  font-size: 2rem;
  margin: 0;
}
.xxxc .btn-primary:hover {
  background-color: black;
}
.xxxc .btn-primary:hover > .icon {
  display: inline;
  margin: 0 0 0 1rem;
}