tour: fix CSS for next/previous buttons

Change-Id: I1d82d08872f674676dc5f81ddf4b3749b22410c0
Reviewed-on: https://go-review.googlesource.com/16134
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/static/css/app.css b/static/css/app.css
index 21cf071..123a30f 100755
--- a/static/css/app.css
+++ b/static/css/app.css
@@ -165,7 +165,7 @@
     line-height: 24px;
     font-size: 24px;
 }
-#right-side .module-bar a {
+.module-bar a {
     color: #375eab;
     position: relative;
     font-weight: bold;
@@ -319,7 +319,7 @@
         left: 50%;
         background: #fff;
     }
-    #right-side .slide-content {
+    .slide-content {
         position: absolute;
         left: 0;
         right: 0;