body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #f5a623, #f29d77);
    margin: 0;
    overflow: hidden;
}

.flashcard-container {
    text-align: center;
    background-color: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
    max-width: 360px;
    margin-bottom: 60px;
}

.flashcard {
    width: 90%;
    height: 200px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.4s;
    margin: 0 auto;
}

.flashcard.is-flipped {
    transform: rotateY(180deg);
}

.flashcard div {
    position: absolute;
    width: 100%;
    height: 90%;
    backface-visibility: hidden;
    border-radius: 15px;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    display: flex;
    box-shadow: 0 4px rgba(0, 0, 0, 0.1);
    font-size: 1.1em;
}

.back {
    transform: rotateY(180deg);
}

button {
    margin: 10px;
    padding: 12px 25px;
    border: none;
    border-radius: 25px;
    background-color: #ff5722;
    color: white;
    font-size: 1.1em;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

button:hover {
    background-color: #e64a19;
}

button:active {
    transform: scale(0.7);
}

.front, .back {
    align-items: center;
    justify-content: center;
}