Cacher is the code snippet organizer for pro developers

/* most field types */ 
.gform_wrapper input[readonly='readonly'] {
    /* custom styles */
}

/* selects */
.gform_wrapper select[disabled='disabled'] {
    /* custom styles */
}

/* checkboxes & radio buttons */
.gform_wrapper input[disabled='disabled'] {
    /* custom styles */
}

/* change font color */
.gform_wrapper input[readonly='readonly'] {
    color: #999;
}

/* hide the "input" */
.gform_wrapper input[readonly='readonly'] {
    border-color: transparent;
}

/* change the cursor */
.gform_wrapper input[readonly='readonly'] {
    cursor: not-allowed;
}

/* all together */
.gform_wrapper input[readonly='readonly'] {
    color: #999;
    border-color: transparent;
    cursor: not-allowed;
}

/* textareas */ 
.gform_wrapper textarea[readonly='readonly'] {
    /* custom styles */
}

/* checkbox & radio button labels */
.gform_wrapper input[disabled='disabled'] + label {
    /* custom styles */
}