diff --git a/content/physics/harmonic-motion.md b/content/physics/harmonic-motion.md
index 13ba3da..75b97dc 100644
--- a/content/physics/harmonic-motion.md
+++ b/content/physics/harmonic-motion.md
@@ -519,9 +519,9 @@ Where:
 Time to combine everything together. We'll continue to use the variable definitions from above, but include $y_m$, or the distance between the center, $m=0$ and some bright fringe of order $m$. When calculating, it can also be assumed that (for small angles) $\sin\theta\approx\theta$.
 
 $$
-\box{d\sin\theta=m\lambda}
+\boxed{d\sin\theta=m\lambda}
 $$
 
 $$
-\box{y_md=Dm\lambda}
+\boxed{y_md=Dm\lambda}
 $$