diff --git a/index.html b/index.html
index bdc5334..8815207 100644
--- a/index.html
+++ b/index.html
@@ -11,6 +11,10 @@
 <script src="https://rawgit.com/paulirish/memory-stats.js/master/bookmarklet.js"></script>
 
 <style>
+	html {
+		/* Scale the text to the window height. We want the text big, esp. on mobiles. */
+		font-size: clamp(1rem, calc(4dvh), 3.5rem);
+	}
 	body {
 		padding: 20px;
 	}