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HTML

              
                <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
  <header id="header" class="header">
    <a href="#features" class="logo-link">
      <img id="header-img" class="header-img" src="https://openclipart.org/download/232062/Logo-Logo-Grayscale.svg" alt="">
      <h1 class="header-title">Free Coding School</h1>
    </a>
    <nav id="nav-bar" class="nav-bar">
      <a class="nav-link" href="#features">Features</a>
      <a class="nav-link" href="#demo">Demo</a>
      <a class="nav-link" href="#newsletter">Newsletter</a>
    </nav>
  </header>
  <main class="main">
    <div class="features" id="features">
      <h2 class="page-title">Learn to code for free with us</h2>
      <p class="page-text">You can start to learn to programme with us for free right now. We offer you many courses which are continuously developing by our volunteers and there are always actual. Read more below and check out our demo video.
      </p>
      <ul class="page-list">
        <li>
          <h3 class="page-list-title">Lessons are easy to understand</h3>
          <p class="page-list-text">One of our goals is giving knowledge in a clear and easy way.</p>
        </li>
        <li>
          <h3 class="page-list-title">Video lessons</h3>
          <p class="page-list-text">Most of the lessons have a short video which shows you how new things works.</p>
        </li>
        <li>
          <h3 class="page-list-title">Many practical examples</h3>
          <p class="page-list-text">Carefully chosen examples are often very useful and ready to use in your projects.</p>
        </li>
        <li>
          <h3 class="page-list-title">A lot of exercises</h3>
          <p class="page-list-text">Each lesson has a lot of short exercises to practice which show you many possibilities.</p>
        </li>
        <li>
          <h3 class="page-list-title">Many projects to build</h3>
          <p class="page-list-text">Each module of lessons has at the end a smaller or bigger project to build.</p>
        </li>
      </ul>
    </div>

    <div class="demo" id="demo">
      <h2 class="page-title">Watch the video about us</h2>
      <iframe id="video" class="iframe" src="https://www.youtube.com/embed/PQ22pgaXog4" title="the demo video" allow="autoplay; encrypted-media" allowfullscreen>
      </iframe>
    </div>

    <div class="newsletter" id="newsletter">
      <h2 class="page-title">Subscribe to receive our lessons on your email</h2>

      <form id="form" class="form" action="https://www.freecodecamp.com/email-submit" method="post">
        <label class="form-label" for="email">Email:</label>
        <input type="email" id="email" class="input-email" name="email" placeholder="Enter your email here" required>
        <input type="submit" id="submit" class="input-submit" value="Subscribe">
      </form>
    </div>
  </main>
  <footer class="footer">
    <span>Created by <a class="footer-link" target="_blank" href="http://mybytes.pl/">Sebastian Sporek</a></span>
  </footer>
              
            
!

CSS

              
                html {
  font-size: 20px;
  font-family: 'Lato', sans-serif;
}

body {
  background-color: #f9f9eb;
  color: black;
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

.header {
  border-bottom: 2px solid black;
  padding: 0px 10px;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: baseline;
      -ms-flex-align: baseline;
          align-items: baseline;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: #f9f9eb;
}

.logo-link {
  text-decoration: none;
  display: block;
}

.header-img {
  width: auto;
  height: 20px;
  display: inline-block;
  margin-top: 10px;
}

.header-title {
  display: inline-block;
  font-size: 1.20rem;
  line-height: 1.25rem;
  margin: 0;
  color: #004d00;
  margin-top: 10px;
}

.nav-bar {
  display: block;
  margin-top: 10px;
}

.nav-link:nth-child(2) {
  margin-left: 8px;
  margin-right: 8px;
}

.nav-link {
  display: inline-block;
  margin-bottom: 10px;
  text-decoration: none;
  font-size: 1rem;
  color: #004d00;
}

.nav-link:hover {
  -webkit-box-shadow: 0 2px 0px 0px #004d00;
          box-shadow: 0 2px 0px 0px #004d00;
}

.features {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  padding: 80px 10px 0px;
  background-color: #f9f9eb;
}

.page-title {
  font-size: 1.15rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.page-text {
  text-align: justify;
  font-size: 1rem;
  line-height: 1.2em;
}

.page-list {
  list-style: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

.page-list li:before {
  content: "\2714";
  font-size: 1.1rem;
  line-height: 1.5rem;
  margin-right: 0.5rem;
  display: inline;
  color: #004d00;
}

.page-list-title {
  font-size: 1.1rem;
  line-height: 1.5rem;
  display: inline;
  margin: 0;
  font-weight: normal;
}

.page-list-text {
  margin: 0 0 1rem 30px;
}

.demo {
  padding: 80px 10px 0px;
}

.iframe {
  display: block;
  width: 100%;
  height: calc((480 / 853) * (100vw - 20px));
  max-width: 853px;
  max-height: 480px;
  margin: 0 auto;
  border: 0;
}

.newsletter {
  padding-top: 80px;
}

.form {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  width: 100%;
  padding: 10px;
  padding-bottom: 50px;
}

.form-label{
  margin-left: 10px;
}

.input-email {
  display: block;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  width: calc(100% - 20px);
  margin: 0.5rem auto 1.5rem;
  padding: 0.5rem;
  background-color: #f9f9eb;
  color: black;
  font-size: 1rem;
  outline: 0;
}

.input-email:required {
  border: 2px solid #004d00;
}

.input-email:invalid:focus {
  border: 2px solid red;
}

.input-email:valid {
  border: 2px solid #004d00;
  background-color: #f9f9eb;
}

.input-submit {
  display: block;
  margin: 0 auto 1rem;
  font-size: 1.25rem;
  color: white;
  padding: 0.5rem 1rem;
  letter-spacing: .1em;
  background-color: #004d00;
  border: 2px solid #004d00;
}

.input-submit:hover {
  cursor: pointer;
  -webkit-box-shadow: 0px 0px 0px 2px #004d00 inset, 0px 0px 0px 4px white inset;
          box-shadow: 0px 0px 0px 2px #004d00 inset, 0px 0px 0px 4px white inset;
}

.footer {
  border-top: 2px solid black;
  text-align: center;
  font-style: italic;
  font-size: 0.75rem;
  padding: 1rem;
  letter-spacing: 1px;
}

.footer-link:visited, .footer-link:active, .footer-link:link {
  color: black;
}

@media (min-width: 700px) {
  .header {
    -webkit-box-pack: start;
        -ms-flex-pack: start;
            justify-content: flex-start;
    padding: 0px 20px 0px 50px;
  }
  .nav-bar {
    margin-left: auto;
  }
  .nav-link {
    margin: 0px 10px 10px;
  }
  .features {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .form {
    max-width: 700px;
    margin: 0 auto;
  }
}

@media (min-width: 1000px) {
  .main {
    max-width: 1000px;
    margin: 0 auto;
  }
}

              
            
!

JS

              
                
              
            
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999px

Console