diff --git a/src/main.ts b/src/main.ts
index 906342a..934d9ee 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -13,8 +13,10 @@ const height_ = 594
 const cellSize_ = 12
 const padding_ = 5 // * cellSize
 
-const xSeeds_ = Math.random().toString(2).substring(46, 54)
-const ySeeds_ = Math.random().toString(2).substring(46, 54)
+const randomSeed = () => Math.random().toString(2).split('.').pop()!.slice(Math.floor(Math.random() * -9))
+
+const xSeeds_ = randomSeed()
+const ySeeds_ = randomSeed()
 const unit_ = 'mm'
 
 // turn these into reactive values to trigger re-rendering on change