How to adjust colour of placeholder text?

I'd like to make the placeholder text a lighter grey.

Hi,

You may insert css code below to your form:

::-webkit-input-placeholder {
   color: #cbc4c2 !important;
}

:-moz-placeholder {  
   color: #cbc4c2 !important;  
}

/*--for IE10 support--*/
:-ms-input-placeholder {
    color: #cbc4c2 !important;
}


You may click link below for the reference of html color coding if you are not sure what light grey color code you prefer:
http://htmlcolorcodes.com/

How to inject CSS codes in your form:
https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

More information about customizing your CSS codes:
https://www.jotform.com/help/75-Customize-Your-Form-Using-Custom-CSS-Codes