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

header {
    background-color: #f4f4f4;
    padding: 10px 20px;
}

header h1 {
    margin: 0;
    font-size: 24px;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin-right: 10px;
}

.welcome {
    float: right;
}

main {
    padding: 20px;
}