diff --git a/frontend/js/labs/_measure.js b/frontend/js/labs/_measure.js
index 9618c3f..00abdc4 100644
--- a/frontend/js/labs/_measure.js
+++ b/frontend/js/labs/_measure.js
@@ -17,7 +17,7 @@
     if (document.getElementById('lm-style')) return;
     var s = document.createElement('style'); s.id = 'lm-style';
     s.textContent = [
-      '#lm-svg{position:fixed;inset:0;z-index:60;pointer-events:none;display:none;}',
+      '#lm-svg{position:fixed;inset:0;width:100vw;height:100vh;z-index:60;pointer-events:none;display:none;}',
       '#lm-svg.on{display:block;}',
       '#lm-svg .lm-hit{pointer-events:auto;cursor:grab;}',
       '#lm-svg .lm-hit:active{cursor:grabbing;}',