The "see rule" button in the issues page doesn't respect button guidelines. It is currently the only button with this style.
In addition to this, the contrast between the button label and the background is not sufficient.
Applying the button style that is existing across SonarQube gives too much visual weight to this element in comparison with the rest of the elements in the issue box. For now, a baby step could be to follow the existing pattern (color, hover...) that we use for the "comment" action (right under "See Rule").