diff --git a/alien-alarm/index.html b/alien-alarm/index.html
index 143e001..59e1c00 100644
--- a/alien-alarm/index.html
+++ b/alien-alarm/index.html
@@ -6,6 +6,7 @@
     <link rel="stylesheet" href="../theme/c-base.css">
     <style>
       body {
+        background-color: hsl(0, 98%, 46%);
         animation: color 0.6s infinite linear alternate;
       }
       h1 {