body{
    height: 100vh;
    overflow: hidden;
    text-align: center;
    background: linear-gradient(180deg, tomato, crimson);
}

.btn{
    height: 10rem;
    width: 10rem;
    border: 0.5rem solid black;
    border-radius: 50%;
    margin: 1rem;
}

.btn_container{
    display: flex;
    justify-content: center;
}

.red{
    background-color: #d95980;
}

.yellow{
    background-color: #63aac0;
}

.green{
    background-color:#f99b45 ;
}

.purple{
    background-color: #819ff9;
}

.flash{
    background-color: white;
}