Markup
<input type="radio" id="odyssey-radio" name="odyssey-radio-name"/>
<label class="odyssey-radio__label [modifier class]" for="odyssey-radio">
<span class="odyssey-radio__bg"></span>
</label>
<input type="radio" id="odyssey-radio-2" name="odyssey-radio-name"/>
<label class="odyssey-radio__label [modifier class]" for="odyssey-radio-2">
<span class="odyssey-radio__bg"></span>
</label>
Source:
src/forms/radio_button.less, line 1