diff --git a/src/components/ruler.vue b/src/components/ruler.vue
index 91123b4..e1be298 100644
--- a/src/components/ruler.vue
+++ b/src/components/ruler.vue
@@ -332,6 +332,7 @@ const ticks = computed(() => {
   }
 
   .content {
+    overflow: hidden;
     position: absolute;
     width: calc(100% - 40px);
     height: calc(100% - 40px);