.center {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  align-items: center;
  align-content: center;
  height: 350px;
  width: 700px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: solid slategray 3px;
  border-radius: 10px;
}

.button {
  cursor: pointer;
  padding: 10px 10px;
  border: solid black 2px;
  border-radius: 10px;
  font-size: large;
  transition: background 0.2s;
}

.button:hover {
  background-color: black;
  color: white;
}