body {

  text-align: center;
}
.btn {
  height: 200px;
  width: 200px;
  border-radius: 15px;
  border: 5px  black solid;
  margin: 1rem;
}
.btn-container {
  display: flex;
  justify-content: center;
}
.yellow {
  background-color: #f99b45;
}
.red {
  background-color: #d95980;
}
.purple {
  background-color: #819ff9;
}
.green {
  background-color: #63aac0;
}
.flash {
background-color: white;
}
.userFlash {
  background-color: green;
}