Nothing special to do for a textbox

    
    <input type="text" class="w1o3" placeholder="Name Surname">
    <input type="email" class="w1o3" placeholder="Enter your email address...">
    <input type="password" class="w1o3" placeholder="Enter your password...">

Nothing special to do for a Select element either...

    
    <select class="w20r">
        <option>Select One</option>
        <optgroup label="Lorem Ipsum">
            <option value="test_one">QYPGqypg ÖÇİŞÜĞöçişüğ</option>
            <option value="test_two">#123.456.789,0</option>
        </optgroup>
        <optgroup label="Dolor Sit">
            <option value="test_three">Test Three</option>
            <option value="test_four">Test Four</option>
        </optgroup>
    </select>

As you can probably guess, nothing special to do for a Checkbox too...
But, just you have to use input + label next pattern.

    <input type="checkbox" value="yes" id="agreement_yes"><label for="agreement_yes" class="w1o2">I've read the agreement.</label>
    <input type="checkbox" value="no" id="agreement_no"><label for="agreement_no" class="w1o2">I don't care about your agreement.</label>

            

Radios are also used the way HTML is designed.
You just have to stick to the input + label next pattern.

    <input type="radio" value="yes" name="agreement" id="agree_radio_yes"><label for="agree_radio_yes" class="w1o2">I've read the agreement.</label>
    <input type="radio" value="no" name="agreement" id="agree_radio_no"><label for="agree_radio_no" class="w1o2">No, I don't know how to read.</label>

            

Yes, just plain textarea...

    <textarea class="w40r h16r" name="textarea" placeholder="Please enter every boring detail about the incident..."></textarea>

            

Oh, great, we have buttons too...

    <input type="submit" class="w1o3" value="This is a submit type input.">
    <input type="reset" class="w1o3" value="This is a reset type input.">
    <button class="w1o3">This is a button input.</button>
    <a href="#" class="button">This is a link button.</a>