diff --git a/src/options.html b/src/options.html
index 656706c..63b2ef8 100644
--- a/src/options.html
+++ b/src/options.html
@@ -6,6 +6,8 @@
       body {
         width: 4rem;
         padding: 0.1rem;
+        font-family: sans-serif;
+        font-size: 12px;
       }
 
       input, label, button {