*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,body{
    height: 100%;
    width: 100%;
}
main{
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.container{
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
}
.btn-container{
    display: flex;
    justify-content: center;
}
.btn{
    height: 200px;
    width: 200px;
    border-radius: 20%;
    border: 8px solid black;
    margin: 2.5rem;
}

.red{
    background-color: red;
}
.green{
    background-color: green;
}
.yellow{
    background-color: yellow;
}
.purple{
    background-color: purple;
}
.flash{
    background-color: #fff;
}
.userflash{
    background-color: #000;
}