I have no access to the html for this form, all theming has to be done via css that is loaded into the iframe which displays the form. Yes, this code is annoying and bad practice, but it is what it is.

<input 
    class="give-input required" 
    type="text" 
    name="give_first" 
    autocomplete="given-name" 
    placeholder="First Name" 
    id="give-first" 
    value="" 
    required="" 
    aria-required="true" 
    style="padding-left: 33px!important;" tabindex="1">

Versions of the below, beginning with #give-first and adding greater specificity, do not work

#give-first-name-wrap input#give-first.give-input.required[style] 
{ 
    padding-left:0; 
}

I don't have a hook to load jQuery into the iframe, very annoyingly!

All suggestions gratefully received.