diff --git a/package.json b/package.json
index b361e7b..f934cdf 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "check": "astro check"
   },
   "lint-staged": {
-    "*.{js,ts,jsx,tsx,astro,html,md,json,yml,yaml}": [
+    "*.{js,ts,jsx,tsx,astro,html,md,json,yml,yaml,css}": [
       "prettier --write",
       "astro check"
     ]
diff --git a/src/content/algorithms/proofs.mdx b/src/content/algorithms/proofs.mdx
index c770058..bdbc839 100644
--- a/src/content/algorithms/proofs.mdx
+++ b/src/content/algorithms/proofs.mdx
@@ -65,8 +65,8 @@ Let $X$ and $Y$ be the number of occurrences of zeroes and ones in the substring
 
 $$
 \begin{align*}
-\sum_{1\leq r\leq n}\sum_{1\leq l<r} f(s[l:r+1])&=\sum_{1\leq r\leq n}\sum_{1\leq l<r} \frac{X+Y+|X-Y|}{2}
-&=\frac{1}{2}(\sum_{1\leq r\leq n}\sum_{1\leq l<r} X+Y+\sum_{1\leq r\leq n}\sum_{1\leq l<r} |X-Y|)
+\sum_{1\leq r\leq n}\sum_{1\leq l<r} f(s[l:r+1]) &= \sum_{1\leq r\leq n}\sum_{1\leq l<r} \frac{X+Y+|X-Y|}{2} \\
+&= \frac{1}{2}(\sum_{1\leq r\leq n}\sum_{1\leq l<r} X+Y+\sum_{1\leq r\leq n}\sum_{1\leq l<r} |X-Y|)
 \end{align*}
 $$