--- a/booket.css	Thu Oct 02 00:19:34 2014 +0200
+++ b/booket.css	Sat Oct 04 22:16:56 2014 +0200
@@ -117,6 +117,25 @@
     height: 2em;
 }
 
+#keyboard-shortcuts {
+    display: none;
+    padding: .5em;
+    font-size: .75em;
+    background: rgba(251, 251, 249, .75);
+    border: 1px solid #d3d7cf;
+    border-radius: .5em;
+    box-shadow: 2px 2px 20px 4px rgba(0, 0, 0, .25);
+}
+
+#keyboard-shortcuts[data-overlay-visible] {
+    display: block;
+    position: fixed;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    z-index: 10;
+}
+
 #actions {
     margin: 1em 0 0 0;
 }
@@ -164,8 +183,7 @@
     padding: 1px 0;
 }
 
-#bookmarklet,
-#keyboard-shortcuts {
+#bookmarklet {
     float: right;
     border: 1px solid #d3d7cf;
     border-radius: .5em;
@@ -198,11 +216,6 @@
     margin: 0;
 }
 
-#keyboard-shortcuts {
-    background-color: #fbfbf9;
-    clear: right;
-}
-
 #keyboard-shortcuts dl {
     margin: 1em 0 0 0;
 }