body {
  font: 1.2em sans-serif;
}

.tiles > div {
  background: rgb(10, 10, 10);
  color: white;
  flex-basis: 100%;
  padding: 10px 20px 15px;
  margin: 10px 20px 10px 0;
  border: 1px solid white;
}

#contact-form {
  display: flex;
  flex-direction: column;
}

input[type='submit'] {
  align-self: flex-start;
  margin-top: 10px;
}   
      

<div class="tiles">
  <div>
    <h2>Contact Us</h2>
    <div id="contact-form">
      <label for="email">Email</label><input id="email" type="email"/>
      <input class="submit" value="Submit" type="submit" />
    </div>
  </div>
</div>
      

// Count the number of 'a' characters in the email form. 
// Update button to reflect that number.