1 files changed, 29 insertions, 0 deletions
diff --git a/packages/gitbook-plugin-theme-default/less/Sidebar.less b/packages/gitbook-plugin-theme-default/less/Sidebar.less
new file mode 100644
index 0000000..1689b9f
--- /dev/null
+++ b/packages/gitbook-plugin-theme-default/less/Sidebar.less
@@ -0,0 +1,29 @@
+.Sidebar-Flex {
+    .flex(0 0 @sidebar-width);
+
+    &.Layout-enter {
+        margin-left: -@sidebar-width;
+
+        &.Layout-enter-active {
+            margin-left: 0;
+            transition: margin-left 250ms ease-in-out;
+        }
+    }
+
+    &.Layout-leave {
+        margin-left: 0;
+
+        &.Layout-leave-active {
+            margin-left: -@sidebar-width;
+            transition: margin-left 250ms ease-in-out;
+        }
+    }
+}
+
+.Sidebar {
+    height: 100%;
+    background: @sidebar-background;
+    background: rgb(250, 250, 250);
+    border-right: 1px solid @sidebar-border-color;
+    overflow-y: auto;
+}