body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: url('bg2.jpg') no-repeat center center fixed;
    background-size: cover;
    color: #fff;
}

header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.7);
    transition: background-color 0.3s;
}

nav {
    display: flex;
    justify-content: center;
    padding: 1em 0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li {
    margin: 0 1em;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
    font-size: 1.2em;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #1abc9c;
}

section {
    padding: 100px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

#home {
    background: rgba(0, 0, 0, 0.5);
}

#about, #watches, #contact {
    background: rgba(0, 0, 0, 0.7);
}

#navbar.scrolled {
    background-color: #40534C;
}