More field capitalization rules

You gave me the below for forcing capitalization of the first letter in a field, but how do I ensure *only* first letter capitalization? I want to simultaneously disallow all caps entries. The Euros completing our forms love to enter their names in all caps. Thank-you.

"You can inject the following CSS code into your form and it will take care of for you.

#first_40, #last_40{

    text-transform :capitalize!important;

} "

Please try the following code: 

#first_40 {

    text-transform: lowercase;

}

#first_40::first-letter {

    text-transform: uppercase;

}

Let us know if that helps.