<!-- Added Open Sans from Google Fonts -->
<link href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,600,600i,700,700i" rel="stylesheet" type="text/css">

<div class="main-cont">
  <div class="label">Email*</div>
  <input type="text">

  <div class="label">Plan*</div>
  <div>
    <input type="radio" name="plan">
    <span>Free</span>

    <input type="radio" name="plan">
    <span>Pro</span>
  </div>

  <div class="label">How did you hear about us?</div>
  <input type="text">

  <br>

  <div id="sign-up" class="button">
    Sign Up
  </div>
</div>

body, * {
  font-family: 'Open Sans', sans-serif;
  box-sizing: border-box;
  color: #383838;
}

.main-cont {
  display: block;
  width: 300px;
  padding: 30px;
  border-radius: 5px;
  margin: auto;
  background: #ececec;
}

.label:not(:first-child),
.button {
  display: block;
  margin-top: 15px;
}

input[type="text"], input[type="password"] {
  width: 100%;
  padding: 8px 10px;
  margin-top: 5px;
  border-radius: 5px;
  border: solid 1px #c7c7c7;
}

fieldset {
  padding: 0;
  border: none;
}

.button {
  display: inline-block;
  padding: 10px 30px;
  border: none;
  border-radius: 5px;
  background-color: #D80000;
  font-size: 16px;
  font-weight: bold;
  color: white;
  cursor: pointer;
}

.button:hover, .button:focus {
  background-color: #A30000;
}

      var btn = document.getElementById('sign-up');

btn.addEventListener('click', function(event) {
  event.preventDefault();
  alert('You asked to sign up!');
});