diff --git a/WebCms/Content/bootstrap/_transitions.scss b/WebCms/Content/bootstrap/_transitions.scss
new file mode 100644
index 0000000..9c0102b
--- /dev/null
+++ b/WebCms/Content/bootstrap/_transitions.scss
@@ -0,0 +1,20 @@
+.fade {
+  @include transition($transition-fade);
+
+  &:not(.show,.in) {
+    opacity: 0;
+  }
+}
+
+.collapse {
+  &:not(.show) {
+    display: none;
+  }
+}
+
+.collapsing {
+  position: relative;
+  height: 0;
+  overflow: hidden;
+  @include transition($transition-collapse);
+}