jachockey012 on "[Plugin: Visual Form Builder] Changing some settings as mentioned on support"

I am looking to change some settings like bg color and font/font size. I have read the support tut on how to fix do this but I still can't seem to get it to work. I have tried changing the css in visual-form-builder-pro/css/visual-form-builder.css and that didnt work so I then tried to add

.visual-form-builder fieldset {
     background-color: #222222;
 }

to the vfb-custom-css.css file and that didn't change the background color. I don't know what I am doing wrong

https://wordpress.org/plugins/visual-form-builder/