Placeholder css

Hi,
I was used to style Caldera Forms with for example https://calderaforms.com/2017/03/styling-transparent-caldera-form-genesis-site/ But it seems that placeholder styling (.caldera-grid input::-webkit-input-placeholder {color: #888c89 !important;} and so on) doesn’t work any more. So I had a look on new Caldera Forms css and tried .caldera-grid .form-control::-webkit-input-placeholder{color:#888c89!important;} and so on. Problem is that it seems to be override by something else. New color appears for milliseconds before been replaced by default color. Could you tell me which css line I have to modify to replace placeholder color?
Best regards.