Custom font in form-block placeholder

Any help is highly appreciated.

I want to change the placeholder font in my forms but don't know how to address it.

This is the code I have already been using:

 .sqs-block-form .field-list .title {
    font-family: 'NunitoSansLight' !important;
    }

.sqs-block-form .field-list .caption-text {
    font-family: 'NunitoSansLight' !important;
    }

.sqs-block-form .sqs-editable-button {
    font-family: 'NunitoSansLight' !important;
}

div.form-block * {
    font-family: 'NunitoSansLight' !important;
}

Try adding this to Custom CSS:

.sqs-block-form .field-element::placeholder {
   font-family: 'NunitoSansLight' !important;
}