body {
    text-align: center;
}
.btn {
    height : 200px;
    width  : 200px;
    border-radius: 20%;
    border: 10px solid black;
    margin: 2.5rem;
}
.btn-container{
    justify-content: center;
    display: flex;
}
.yellow{
  background-color: #f99645 ;
}
.red{
  background-color: #d95980 ;
}
.purple{
  background-color: #849ff9;
}
.green{
  background-color: #63aac0;
}
.flash {
    background-color: white;
}
.userflash{
  background-color: green;
}