Let me give you some help instead of just showing the problem and answer.
Most of the time when you want help on our forum, you should provide a link to a running example of your code. I created your code in a codepen here:
When you run into issues like this, it is a good idea to open up the developer tools and inspect the element you are trying to edit (click image to zoom in):
If you look at the classes modifying the element on the right, you will see that you also have .bg-warning on there which is adding a goldish color. This is how you can easily tell which classes to modify/remove. If I remove the bg-warning class, I then have the gold color I wanted.