diff --git a/src/snek/templates/sandbox.html b/src/snek/templates/sandbox.html
index 0322b00..5306b6e 100644
--- a/src/snek/templates/sandbox.html
+++ b/src/snek/templates/sandbox.html
@@ -39,7 +39,7 @@ function glowCSSVariable(varName, glowColor, duration = 500) {
   const root = document.documentElement;
 
   //igetComputedStyle(root).getPropertyValue(varName).trim();
-  glowColor = lightenColor(glowColor, 20);
+  glowColor = lightenColor(glowColor, 40);
   root.style.setProperty(varName, glowColor);
   setTimeout(() => {
     root.style.setProperty(varName, originalColor);