HTML-Prototype Schulpaket

<div class="form-group">
  <label for="demoform-number">Enter a number</label>
  <input class="" type="number" id="demoform-number" name="" placeholder="Enter a Number" pattern="[0-9]*"/>
</div>
<div class="form-group has-error">
  <label for="demoform-number-error">Enter a number</label>
  <input class="" type="number" id="demoform-number-error" name="" placeholder="Enter a Number" pattern="[0-9]*"/>
  <div class="form-group__error" role="alert">This field is required</div>
</div>