Hovering over a linked diagram element should create visible change

Problem/Motivation

Currently if a diagram element is linked, there is no visible indication that it is a link when you hover over it.

It should have some visible change on hover that makes it.

I tried adding

.mermaid-diagram svg a:hover {
  outline-color: blue;
  outline-width: 4px;
}

But it only seemed to impact when the link was made active by clicking on it. I am guessing Mermaid may be getting in the way of this change.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes