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CSS CSS - Beyond the Basics Understanding Flexbox and Multi-Column Layout Flexbox Challenge

I don't understand what is the top rule here: "First, set a flex formatting context in the top .nav, .main rule."


Regarding "Challenge Task 1 of 4: First, set a flex formatting context in the top .nav, .main rule."

I'm setting <code> .nav, .main { display : -webkit-flex; } </code>

but I'm getting "Bummer! Make sure you're using the display property in the top rule."

I guess I don't understand what is the top rule.

Could you please help out?


/* Complete the challenge by writing CSS below */

.main {
   display : -webkit-flex;

.nav {

.nav li {

.primary {
<!DOCTYPE html>
    <link rel="stylesheet" href="page.css">
    <link rel="stylesheet" href="style.css">
    <ul class="nav">
        <li><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Articles</a></li>
        <li><a href="#">Contact</a></li>
    <div class="main">
        <div class="secondary col">
                Maecenas volutpat nisi vitae purus gravida, ac pulvinar enim venenatis. Fusce ac pharetra ipsum. Suspendisse potenti. Etiam placerat rhoncus mi id ornare.
        <div class="primary col">
                Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent id mollis neque. Phasellus rutrum iaculis ante, id tincidunt tellus pulvinar vitae. Maecenas sodales mollis nisi sit amet congue. 
                Duis pharetra, sem in dictum posuere, justo orci vestibulum arcu, vitae lobortis ipsum nibh sed dolor. Vestibulum sodales pulvinar risus vel fermentum. Nunc sit amet eros eget orci euismod imperdiet. Phasellus scelerisque orci non ipsum vestibulum non eleifend.
        <div class="tertiary col">
                Donec id ultrices diam. Praesent efficitur vulputate eros ac aliquam. Ut et libero ultricies, mattis velit sit amet, suscipit sem. Aenean dictum pellentesque tincidunt. 

After I deleted the colon after the display, it worked. Is this a course bug?

1 Answer