To use the forms, you just have to surround your input with a div with the attribute _form-group
.
<div _form-group>
<label for="input_test_1">Input test 1</label>
<input id="input_test_1" type="text">
</div>
<div _form-group>
<label for="textarea_1">Texarea 1</label>
<textarea id="textarea_1"></textarea>
</div>
<div _select-group>
<label for="select_1">Texarea 1</label>
<select id="select_1">
<option value="0">Value 1</option>
<option value="1">Value 2</option>
<option value="2">Value 3</option>
<option value="3">Value 4</option>
<option value="4">Value 5</option>
</select>
</div>
<div _form-group>
<input type="checkbox" id="checkbox_1">
<label for="checkbox_1">Checkbox 1</label>
</div>
<div _form-group>
<input type="radio" id="radio_1">
<label for="radio_1">Checkbox 1</label>
</div>
<div _form-group>
<label for="range_1">Range 1</label>
<input id="range_1" max="100" min="0" type="range" value="45">
</div>