body {
  text-align: center;
}

.btn {
  height: 200px;
  width: 200px;
  border: 8px solid black;
  border-radius: 20%;
  margin: 0.75rem;
}

.btn-container {
  display: flex;
  justify-content: center;
}

.red {
  background-color: rgba(255, 0, 0, 0.8);
  /* background-color: #f99b45; */
}

.yellow {
  background-color: rgba(255, 255, 0, 0.8);
  /* background-color: #d95980; */
}

.green {
  background-color: rgba(0, 128, 0, 0.8);
  /* background-color: #819ff9; */
}

.purple {
  background-color: rgba(128, 0, 128, 0.8);
  /* background-color: #63aac0; */
}

.flash {
    background-color: white;
}