Как переделать выпадающий список в выпадающие радиокнопки? По возможности с чекбоксами

.btn {
  background-color: #2196F3;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  outline: none;
}

.dropdown {
  position: absolute;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  z-index: 1;
}

.dropdown-content .dropdown-level {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content .dropdown-level:hover {
  background-color: #ddd
}

.dropdown:hover .dropdown-content {
  display: block;
}

.btn:hover, .dropdown:hover .btn {
  background-color: #0b7dda;
}

<div class="dropdown">
  <button class="btn" style="border-left:1px solid navy">
    <i class="fa fa-caret-down"></i>
  </button>
  <div class="dropdown-content">
    <div class="dropdown-level">
      <input type="radio" id="radiobutton_1" name="group">
      <label for="radiobutton_1">Radiobutton 1</label>
    </div>
    <div class="dropdown-level">
      <input type="radio" id="radiobutton_2" name="group">
      <label for="radiobutton_2">Radiobutton 2</label>
    </div>
    <div class="dropdown-level">
      <input type="checkbox" id="radiobutton_3">
      <label for="radiobutton_3">Radiobutton 3</label>
    </div>
  </div>
</div>