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HTML

              
                <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro" rel="stylesheet">
<header id="header">

  <h1 id="company-name"><a href="#">Block Buddies</a></h1>

  <nav id="nav-bar">
    <a class="nav-link" href="#about">About</a>
    <a class="nav-link" href="#blockchain">What's Blockcain?</a>
    <a class="nav-link" href="#services">Services</a>
  </nav>

</header>

<main>

  <div class="section" id="about">

    <div id="hero">
      <div id="hero-textbox">
        <div class="hero-text">Block buddies is here to teach you all about bloackchain and cryptocurrencies.</div>
      </div>
    </div>

  </div>

  <div class="section" id="blockchain">
    <h2>What's Blockhain?</h2>
    <iframe id="video" width="1044" height="587" src="https://www.youtube.com/embed/r43LhSUUGTQ" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
  </div>

  <div class="section" id="services">

    <h2>Services</h2>
    <div id="product-list">
      <div class="services">Review of the sign-up procedures on a reputable global digital exchange</div>
      <div class="services">An outline of the steps for a digital asset purchase</div>
      <div class="services">A highlight of various options for digital asset storage</div>
      <div class="services">A discussion on the various resources, tools, and applications needed to keep you on top of your digital assets</div>

    </div>

    <div id="registration">

      <p>Join our mailing list for information about <strong>Blockchain!</strong></p>

      <form id="form" action="https://www.freecodecamp.com/email-submit">
        <input type="email" id="email" name="email" placeholder="Email Address">
        <input id="submit" type="submit"></input>
      </form>
    </div>
  </div>

</main>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Source+Code+Pro');
@import url('https://fonts.googleapis.com/css?family=Roboto|Source+Code+Pro');

body{
  font-family: 'Roboto', sans-serif;
}

#header {
  position: sticky;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  top: 0px;
  height: 50px;
  background-color: rgba(255,255,255,0.9);
  padding: 10px 20px 10px 20px;
  border-bottom: 1px solid black;
}

#header-img {
  float: left;
  width: 200px;
}

#company-name a {
  color: black;
  font-family: 'Source Code Pro', monospace;
  text-decoration: none;
  
}

#nav-bar {
    display: inline-block;
}

#nav-bar a {
  display: inline-block;
  position: relative;
  top: 6px;
  margin: auto 2px;
  border-radius: 10px;
  background: #6ec0c5;
  color: white;
  padding: 5px 10px;
  font-size: 0.6em;
  text-decoration: none;
  text-transform: uppercase;
}

#nav-bar a:hover {
  background-color: #5e95ed;
}


.section {
  min-height: 300px;
}

#hero {
  position: relative;
  margin: 50px auto;
  width: 95%;
  height: 400px;
  overflow: hidden;
    background: url(https://cdn.pixabay.com/photo/2017/12/14/14/23/blockchain-3019120_1280.png) #6ec0c5;
  background-repeat: no-repeat;
  background-size: 100% auto;
  background-position: center;
}

#hero-textbox {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  background-color: rgba(255,255,255,0.9);
  position: relative;
  top: 20px;
  height: 340px;
  margin: auto;
  padding: 7px 20px;
  border: 3px solid white;
}

#hero-textbox {
  width: 350px;
}

.hero-text {
    text-align: center;
    font-size: 120%;
  font-weight: 500;
}

#blockchain {
  text-align: center;
}

iframe {
  width: 500px;
  height: 280px;
}

#registration {
  width: 40%;
  padding: 20px;
  margin:auto;
  text-align: center;
  border: 2px solid;
}

input {
  padding: 10px;
}

#submit {
  background-color: #2A878B;
  border: 1px solid #2A878B;
  color: white;
}

#email {
  width: 70%;
  margin: 10px;
}

#product-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  margin-bottom: 50px;
}

h2 {
  text-align: center;
  color: white;
  background-color: black;
  text-transform: uppercase;
  width: 100vw;
  padding-top: 1em;
  padding-bottom: 1em;
  
}

.services {
  width: 150px;
  margin: 20px;
  text-align: center;
  font-size: 1.2em;
  padding: 20px;
  border-radius: 10px;
  background-color: #2A878B;
  color: white;
}

@media screen and (max-width: 510px) {
  
  iframe {
    width: 100%;
    height: 280px;
  }
  
  #hero-textbox {
  width: 70%;
  }
  
  .hero-text {
    text-align: center;
    font-size: 100%;
    font-weight: 500;
  }
  
  #header {
    flex-direction: column;
    height: auto;    
  }
  
  #header-img {
    margin-bottom: 10px;
  }
  
  #nav-bar a {
    display: block;
    margin: 5px;
    width: 70%;
    text-align: center;
  }
  
    #hero {
    background-size: auto 100%;
    background-position: center;
  }
}

@media screen and (max-width: 720px) {
  #hero {
    background-size: auto 500px;
    background-position: center;
  }
}
              
            
!

JS

              
                
              
            
!
999px

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