Uso da classe form

<div class="wrapper">
    <form class="form">
        <input type="text" class="form__input">
        <select name="" id="" class="form__input-select">
            <option name="" id="">Teste</option> 
            <option name="" id="">Teste</option> 
        </select> 
        
        <div class="form__radio">
            <input type="radio" name="teste" id="teste" value="teste" checked>
            <label for="teste" class='checked'></label>
            <span>Masculino</span>
        </div>
        <div class="form__radio">
            <input type="radio" name="teste" id="teste2" value="teste">
            <label for="teste2"></label>
        </div> 
       
        <textarea name="" id="" class="form__input-textarea"></textarea>
        <input type="submit" value="Teste" class="form__submit">
    </form>
</div>