diff --git a/ts/bootstrap/BUILD.bazel b/ts/bootstrap/BUILD.bazel
new file mode 100644
index 000000000..6af952c9e
--- /dev/null
+++ b/ts/bootstrap/BUILD.bazel
@@ -0,0 +1,23 @@
+load("//ts:vendor.bzl", "pkg_from_name", "vendor_js_lib")
+load("@io_bazel_rules_sass//:defs.bzl", "sass_library")
+
+# copy bootstrap sass files in
+vendor_js_lib(
+    name = "sass-sources",
+    include = [
+        "scss",
+    ],
+    base = "external/npm/node_modules/bootstrap/",
+    pkg = pkg_from_name("bootstrap"),
+    strip_prefix = "scss/",
+    visibility = ["//visibility:private"],
+)
+
+# wrap them in a library
+sass_library(
+    name = "scss",
+    srcs = [
+        ":sass-sources",
+    ],
+    visibility = ["//visibility:public"],
+)
diff --git a/ts/vendor.bzl b/ts/vendor.bzl
index f88920c4c..9eb4dcde6 100644
--- a/ts/vendor.bzl
+++ b/ts/vendor.bzl
@@ -26,7 +26,7 @@ vendor_js_lib = rule(
     },
 )
 
-def _pkg_from_name(name):
+def pkg_from_name(name):
     return "@npm//{0}:{0}__files".format(name)
 
 #
@@ -37,7 +37,7 @@ def _pkg_from_name(name):
 def copy_jquery(name = "jquery", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name(name),
         include = [
             "dist/jquery.min.js",
         ],
@@ -48,7 +48,7 @@ def copy_jquery(name = "jquery", visibility = ["//visibility:public"]):
 def copy_jquery_ui(name = "jquery-ui", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name("jquery-ui-dist"),
+        pkg = pkg_from_name("jquery-ui-dist"),
         base = "external/npm/node_modules/jquery-ui-dist/",
         include = [
             "jquery-ui.min.js",
@@ -59,7 +59,7 @@ def copy_jquery_ui(name = "jquery-ui", visibility = ["//visibility:public"]):
 def copy_protobufjs(name = "protobufjs", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name(name),
         include = [
             "dist/protobuf.min.js",
         ],
@@ -70,7 +70,7 @@ def copy_protobufjs(name = "protobufjs", visibility = ["//visibility:public"]):
 def copy_mathjax(name = "mathjax", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name(name),
         include = [
             "es5/tex-chtml.js",
             "es5/input/tex/extensions",
@@ -88,7 +88,7 @@ def copy_mathjax(name = "mathjax", visibility = ["//visibility:public"]):
 def copy_css_browser_selector(name = "css-browser-selector", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name(name),
         include = [
             "css_browser_selector.min.js",
         ],
@@ -98,18 +98,19 @@ def copy_css_browser_selector(name = "css-browser-selector", visibility = ["//vi
 def copy_bootstrap_js(name = "bootstrap-js", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name("bootstrap"),
         include = [
             "dist/js/bootstrap.bundle.min.js",
         ],
         strip_prefix = "dist/js/",
         visibility = visibility,
+        base = "external/npm/node_modules/bootstrap/",
     )
 
 def copy_bootstrap_css(name = "bootstrap-css", visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name("bootstrap"),
         include = [
             "dist/css/bootstrap.min.css",
         ],
@@ -120,7 +121,7 @@ def copy_bootstrap_css(name = "bootstrap-css", visibility = ["//visibility:publi
 def copy_bootstrap_icons(name = "bootstrap-icons", icons = [], visibility = ["//visibility:public"]):
     vendor_js_lib(
         name = name,
-        pkg = _pkg_from_name(name),
+        pkg = pkg_from_name(name),
         include = ["icons/{}".format(icon) for icon in icons],
         strip_prefix = "icons/",
         visibility = visibility,