Gmail
  • Imagenes
  • Icon
  • Photo
    • "> Gmail
  • Imagenes
  • Icon
  • Photo
    • "> Gmail
  • Imagenes
  • Icon
  • Photo
    • "> 
    <body>
    <header>
        <nav>
            <ul>
                <li>
                    <a href="#">Gmail</a>
                </li>
                <li>
                    <a href="#">Imagenes</a>
                </li>
                <li>
                    <a href="#">Icon</a>
                </li>
                <li>
                    <a href="#">Photo</a>
                </li>
            </ul>
        </nav>
    </header>
</body>

    body {
    margin: 0;
    padding: 0;
    font-size: 13px;
    font-family: Arial, Helvetica, sans-serif;
}   

header {
    width: 100%;
    height: 60px;
}

header nav {
    display: flex;
    justify-content: flex-end;
}