body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Arial', sans-serif;
    background: url('background.jpg') no-repeat center center fixed;
    background-size: cover;
    color: white;
    text-align: center;
}

header {
    position: absolute;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 20px 50px;
    background: rgba(0, 0, 0, 0.5);
}

header .logo {
    font-size: 24px;
    font-weight: bold;
}

header nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

header nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
}

main {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}