body{
    text-align: center;
}
.btn-container{
    display: flex;
    justify-content: center;
    
}
.btn{
    height: 200px;
    width: 200px;
    border: 10px black solid;
    border-radius: 30px;
    margin: 1rem;
}
.red{
    background-color: #d95980;
}
.yellow{
    background-color: #f99b45;
}
.green{
    background-color: #63aac0;
}
.purple{
    background-color: #819ff9;
}
.flash{
    background-color: white;
}
.userFlash{
    background-color: rgb(27, 216, 62);
}

/* button */
#startBtn {
    margin: 20px 0;
    padding: 10px 25px;
    font-size: 18px;
    font-weight: bold;
    color: white;
    background-color: #4CAF50;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

#startBtn:hover {
    background-color: #45a049;
    transform: scale(1.05);
}

#startBtn:active {
    transform: scale(0.98);
}


/* Responsiveness for phone  */
@media (max-width: 500px) {

    .btn {
        width: 140px;
        height: 140px;
        margin: 0.5rem;
        border-width: 6px;
        border-radius: 20px;
    }

    h1 {
        font-size: 2rem;
    }

    h2,
    h3 {
        font-size: 1.2rem;
    }
}