Appearance of disabled radio button

Hello,

how can i modify the appearance of disabled radio button. By default it looks like this:


I've tried it via Custom CSS but i don't no how to address the button.
The radio button is defined as custom in View as:

$disabled=$_SESSION["disable_edit"];
if ($disabled == "disabled") {
	$class = "chDisableUpdate";
} else {
	$class = "chAutoUpdate";
}
$value="<input class='".$class."' type=radio name='vx".$data[$keyField]."' value='1' data-fieldname='v1' data-editid='".$data[$keyField]."' ";
 	if ($data[$field]==1) $value.="checked ";
 	$value.=$disabled.">&nbsp&nbsp&nbsp&nbsp";
$value.="<input class='".$class."' type=radio name='vx".$data[$keyField]."' value='2' data-fieldname='v2' data-editid='".$data[$keyField]."' ";
 	if ($data[$field]==2) $value.="checked ";
 	$value.=$disabled.">&nbsp&nbsp&nbsp&nbsp&nbsp";
$value.="<input class='".$class."' type=radio name='vx".$data[$keyField]."' value='3' data-fieldname='v3' data-editid='".$data[$keyField]."' ";
 	if ($data[$field]==3) $value.="checked ";
 	$value.=$disabled.">&nbsp&nbsp&nbsp&nbsp&nbsp";
$value.="<input class='".$class."' type=radio name='vx".$data[$keyField]."' value='4' data-fieldname='v4' data-editid='".$data[$keyField]."' ";
 	if ($data[$field]==4) $value.="checked ";
 	$value.=$disabled.">&nbsp&nbsp&nbsp&nbsp&nbsp";
$value.="<input class='".$class."' type=radio name='vx".$data[$keyField]."' value='5' data-fieldname='v5' data-editid='".$data[$keyField]."' ";
 	if ($data[$field]==5) $value.="checked ";
 	$value.=$disabled.">"; 

I've tried it to access with different classes, but as i described, i'm not able to find the right id for CSS. That is what i've tried in Custom CSS until yet:

.chDisableUpdate {...
.radio.chDisableUpdate {...
span.chDisableUpdate {...
td.bs-gridcell.chDisableUpdate {...

and also with ...[disabled] { ...

How can i find out the right id for Custom CSS.

Thanks for your help
Dieter