body{
    justify-content: center;
    text-align: center;
}
.btn{
    height:200px;
    width: 200px;
    border-radius: 20%;
    border: 10px solid black;
    margin:1.5rem;
}
.btn-container{
    display: flex;
    justify-content: center;
}
.yellow{
    background-color: yellow;
}
.red{
    background-color: red;
}
.green{
    background-color: green;
}
.purple{
    background-color: purple;
}
.flash{
    background-color: white;
}
.userflash{
    background-color: pink;
}