diff --git a/main.css b/main.css
new file mode 100644
index 0000000..2a24a7f
--- /dev/null
+++ b/main.css
@@ -0,0 +1,4 @@
+body {background: #eff;}
+#left, #right {width: 5em;}
+#__answer__ {visibility: hidden;}
+h2:hover + #__answer__ {visibility: visible;}