Add Twitter Bootstrap v3.0.3.

_assets/vendor/bootstrap/examples/offcanvas/offcanvas.css

@@ -0,0 +1,51 @@
+/*
+ * Style tweaks
+ * --------------------------------------------------
+ */
+html,
+body {
+  overflow-x: hidden; /* Prevent scroll on narrow devices */
+}
+body {
+  padding-top: 70px;
+}
+footer {
+  padding: 30px 0;
+}
+
+/*
+ * Off Canvas
+ * --------------------------------------------------
+ */
+@media screen and (max-width: 767px) {
+  .row-offcanvas {
+    position: relative;
+    -webkit-transition: all 0.25s ease-out;
+    -moz-transition: all 0.25s ease-out;
+    transition: all 0.25s ease-out;
+  }
+
+  .row-offcanvas-right
+  .sidebar-offcanvas {
+    right: -50%; /* 6 columns */
+  }
+
+  .row-offcanvas-left
+  .sidebar-offcanvas {
+    left: -50%; /* 6 columns */
+  }
+
+  .row-offcanvas-right.active {
+    right: 50%; /* 6 columns */
+  }
+
+  .row-offcanvas-left.active {
+    left: 50%; /* 6 columns */
+  }
+
+  .sidebar-offcanvas {
+    position: absolute;
+    top: 0;
+    width: 50%; /* 6 columns */
+  }
+}