body {
    margin: 0;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    text-align: center;
    background-color: beige;
}

header {
    position: fixed;
    width: 100%;
    background: darkgreen;
    color: white;
    padding: 15px;
    transition: 0.3s;
}

nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

.hero {
    height: 100vh;
    background: linear-gradient(lightgreen,green);
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

section {
    padding: 100px 20px;
}

img {
    width: 250px;
    margin: 15px 0;
    border-radius: 10px;
}

.content-hidden {
    opacity: 0;
    transform: translateY(30px);
    transition: 0.6s ease;
}

.content-hidden.show {
    opacity: 1;
    transform: translateY(0);
}

.extra-content {
    display: none;
    margin-top: 15px;
}

button {
    padding: 10px 15px;
    background: green;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: darkgreen;
}