JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset data-role="controlgroup" data-type="vertical" style="text-align: center">
  <div class="centerRadio">
   <input type="radio" name="radio-choice-1" id="radio-choice-1" value="choice-1" checked="checked" />
   <label for="radio-choice-1">A</label>
   <input data-theme="e" type="radio" name="radio-choice-1" id="radio-choice-2" value="choice-2"  />
   <label for="radio-choice-2">B</label>
 </div>
</fieldset>

<a href="#settings" data-role="button" id="buton" class="activeOnce">Button</a>

CSS

.ui-btn.activeOnce
{
  width:80%;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.centerRadio
{
width: 50%; margin: 0 auto;
}