body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}
.joke-container {
    width: 90%;
    max-width: 500px;
    padding: 2em;
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: opacity 1s ease-in-out;
}
.joke {
    font-size: 1.2em;
    font-style: italic;
    color: #333;
    margin-bottom: 1em;
}
.punchline {
    font-size: 1em;
    color: #666;
    font-weight: bold;
}
.punchline.hidden {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease-in-out, visibility 0s 0.5s;
}
.punchline.visible {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease-in-out;
}