#flashcard-app { max-width: 600px; margin: 20px auto; text-align: center; }
.card { padding: 40px; margin-bottom: 16px; background: #fff; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); cursor: pointer; }
.card-content { font-size: 24px; }
button { margin: 4px; padding: 8px 16px; font-size: 16px; cursor: pointer; }