diff --git a/build.py b/build.py
index 0c69be6..3dd777c 100644
--- a/build.py
+++ b/build.py
@@ -14,9 +14,6 @@ TEMPLATE = """<!DOCTYPE html>
     <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.min.js"></script>
     <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/contrib/auto-render.min.js" onload="renderMathInElement(document.body);"></script>
     <style>
-        body::before {{
-            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cpath d='M0 0 L60 60 M60 0 L0 60' stroke='%23003366' stroke-width='0.5' opacity='0.05'/%3E%3C/svg%3E");
-            background-size: 60px 60px;}}
         body {{ 
             font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; max-width: 900px; margin: 0 auto; padding: 20px; line-height: 1.6; color: #333; 
              }}
