* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
}

header {
    background-color: #333;
    color: white;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav ul {
    list-style-type: none;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}