body {
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 2rem;
    background: linear-gradient(135deg, #fceabb, #f8b500);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: #444;
}

.btn-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.btn {
    height: 150px;
    width: 150px;
    border-radius: 20%;
    border: 8px solid #333;
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

.red {
    background-color: #d95980;
}

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

.yellow {
    background-color: #f99b45;
}

.purple {
    background-color: #e27fe2;
}

.flash {
    background-color: white !important;
    color: #333;
}