Problem with adding div in Exercise 11


I have a problem with exercise 11. Button "Run" doesn't appear. Please Help! There aren't any error messages. I use Linux Mint 17.1 Operating System and Mozilla Firefox 46.0.1 .

<!DOCTYPE html>
  <title>Ollie Bike Sharing</title>
  <meta charset="utf-8"/>
  <link rel="stylesheet" type="text/css" href="main.css">
  <div class="container">
        <li>sign up</li>
        <li>search bikes</li>
        <li>reserve a bike</li>
        <li>about us</li>
      <h1>Ollie Bike Sharing</h1>
      <h3>Share Your Pedals with the World.</h3>
      <p>Need a set of wheels while you're in town? Use Ollie to pair your perfect vacation with a stylish, affordable bike rental. Here is a <a href="cities.html">list</a> of cities where you can find us.</p>
      <video width="320" height="240" controls>
        <source src="" type="video/mp4">


Could you post a screenshot of your whole web browser so that we can see what you see?



I solved the problem. Today I run again Firefox and "Run" button works. Thank you.


So what's the solution for that @albionsrefuge


I don't know. From what @gomola2002, the person with the problem, said the problem went away when they tried later.