<form class="form form_flowers">
<div class="form__group">
<div class="label-group">
<label class="label-group__label" for="test">Текст</label>
</div>
<div class="input-group">
<input class="input-group__input" type="text" id="test">
<span class="input-group__addon">
@
</span>
</div>
</div>
</form>