Phoenix Reisen Styleguide
Example

Deaktiviert

Markup
<label class="select ">
  <select name="" onchange="">
    <option selected="">Select</option>
    <option value="">Option 1</option>
    <option value="">Option 2</option>
    <option value="">Option 3</option>
  </select>
  <span class="select__label">
    Select Label
  </span>
</label>
<p><em>Deaktiviert</em></p>
<label class="select ">
  <select name="" onchange="" disabled="disabled">
    <option selected="">Select</option>
    <option value="">Option 1</option>
    <option value="">Option 2</option>
    <option value="">Option 3</option>
  </select>
  <span class="select__label">
    Select Label
  </span>
</label>
Source: src/components/_forms.scss, line 593