How to add a dark border to input fields on Contact Us page?

[RosalynnSkin]

Hello, I would like to add a dark border, black, around the input fields,  

like so how can I do that without fiddling with theme settings?

[Nick_Marketing]

You could add this code to the bottom of theme.scss.css.

#ContactFormName {
  border-color: #000;
  border-width: 2px
}
#ContactFormEmail {
  border-color: #000;
  border-width: 2px
}
#ContactFormMessage {
  border-color: #000;
  border-width: 2px
}