example

// style.css
form#donation div label {
  margin: 0 0 5px 0;
}

form#donation div input {
  margin: 1em 0 5px 0;
}

#donation button.btn {
  padding: 5px 10px;
  background: blue;
  color: #fff;
}

// partials/donation.html
<form id="donation">
  <div>
    <label>First name</label>
    <input type="text" name="fname" />
    
    <label>Last name</label>
    <input type="text" name="lname" class="btn" />
  </div>
  <button type="submit">donate</button>
</form>