Fieldset and legend

<fieldset class="mbl">
<legend>Tracking type</legend>
<div class="flex flex-wrap gcl">
  <label class="form__radio"><input type="radio" name="radios" />RFID tracking</label>
  <label class="form__radio"><input type="radio" name="radios" checked />Barcode tracking</label>
  <label class="form__radio"><input type="radio" name="radios" />Without tracking</label>
</div>
</fieldset>

<fieldset>
<legend>
  Container size
</legend>
<div class="flex flex-wrap gcs">
  <label class="form__label">
    Height
    <input class="form__control" />
  </label>
  <label class="form__label">
    Width
    <input class="form__control" />
  </label>
  <label class="form__label">
    Length
    <input class="form__control" />
  </label>
</div>
</fieldset>