.xcontainer {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.xbox {
  background: rgba(255,255,255,.7);
  border-radius: 5px;
  padding: 20px;
  text-align: center;
  display: flex;
  align-items: flex-end;
}