body {
    text-align: center;
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}

h1 {
    margin-top: 20px;
}

.btn-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 30px;
}

.row {
    display: flex;
}

.btn {
    height: 150px;
    width: 150px;
    border-radius: 20%;
    border: 8px solid black;
    margin: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Colors */
.pink {
    background-color: #ff6b81;
}

.green {
    background-color: #2ed573;
}

.yellow {
    background-color: #ffa502;
}

.purple {
    background-color: #a55eea;
}

/* Hover Effect */
.btn:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

/* Flash Effects */
.flash {
    background-color: white !important;
}

.userflash {
    background-color: lightgreen !important;
}