.fade-in {
    opacity: 0;
    animation: fadeInAnimation 2s forwards;
}
@keyframes fadeInAnimation {
    to {
        opacity: 1;
    }
}
.hidden {
    opacity: 0;
    transition: opacity 1s;
}
.visible { 
    opacity: 1;
    transition: opacity 1s;
}

body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin-top: 50px;
    background: radial-gradient(circle, #410469 0%, #ffa1eb 100%);
    color: #ffffff;
}

#nextpage {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 20px;
    font-family: cursive;
    background: linear-gradient(45deg, #ff6ec4, #7873f5);
    border: none;
    border-radius: 5px;
    color: white;
    transition: box-shadow 0.3s, transform 0.3s;
}
button:hover {
    box-shadow:
     0 0px 20px rgba(0, 0, 0, 0.2),
     0 0px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}