I am trying to get to be set to an opacity: .04;, and when hovered over to be opacity:1; however, my img hover is not functioning. I am unsure of why t
opacity: .04;
opacity:1;
Adjust your approach in your CSS. You are setting the opacity using the .intro-img class, so you will need to use the same class.
img.intro-img:hover { opacity: 1; }