diff --git a/popup.css b/popup.css
new file mode 100644
index 0000000..620d6a8
--- /dev/null
+++ b/popup.css
@@ -0,0 +1,26 @@
+body {
+  margin: 0;
+  font-family: Arial, sans-serif;
+  -webkit-user-select: none;
+}
+div#options {
+  border: solid 1px gray;
+  border-radius: 2px;
+  width: 150px;
+}
+div#options div.option {
+  text-align:center;
+  padding:8px;
+  background-color:#EEEEEE;
+  border-bottom: solid 1px gray;
+  cursor: pointer;
+}
+div#options div.option:hover {
+  background-color:#DDDDDD;
+}
+div#options div.option:active {
+  background-color:#CCCCCC;
+}
+div#options div.option:last-child {
+  border-bottom: none;
+}