material-design-lite/src/checkbox/snippets/check-off.html

Material Design Components in CSS, JS and HTML

<label class="mdl-checkbox mdl-js-checkbox mdl-js-ripple-effect" for="checkbox-2">
  <input type="checkbox" id="checkbox-2" class="mdl-checkbox__input">
  <span class="mdl-checkbox__label">Checkbox</span>
</label>