body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    margin: 0;
}

header {
    background-color: #4267B2;
    padding: 10px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    padding: 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav ul li a:hover {
    background-color: #365899;
}

main {
    padding: 20px;
    text-align: center;
}

h1 {
    color: #1c1e21;
}