diff --git a/.gitignore b/.gitignore
index c96e00fb..ff05ccc2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,15 @@
 Manifest.toml
 
+/doc/build/
+/stylesheets/bootswatch/
+
 examples/figures/
 examples/*.md
 examples/*.pdf
 examples/*.html
 examples/*.rst
 examples/*.tex
+
 test/**/cache
 test/**/figures
 test/documents/output/gadfly_formats_test.txt
@@ -19,10 +23,6 @@ test/**/chunk_options.jl
 test/**/*.ipynb
 !test/**/*ref.*
 
-doc/build
-doc/site
-
-.idea
 *.*~
 *.aux
 *.log
diff --git a/deps/build.jl b/deps/build.jl
new file mode 100644
index 00000000..941a1cf9
--- /dev/null
+++ b/deps/build.jl
@@ -0,0 +1,24 @@
+# # to update `themes`
+# let
+#     using HTTP, JSON
+#     r = HTTP.request("GET", "https://bootswatch.com/api/4.json") |> HTTP.payload |> String |> JSON.parse
+#     lowercase.(get.(values(r["themes"]), "name", "")) |> repr |> clipboard
+# end
+
+bootswatch_version = "4"
+themes = ["cerulean", "cosmo", "cyborg", "darkly", "flatly", "journal", "litera", "lumen", "lux", "materia", "minty", "pulse", "sandstone", "simplex", "sketchy", "slate", "solar", "spacelab", "superhero", "united", "yeti"]
+targets = ["bootstrap.min.css", "_bootswatch.scss", "_variables.scss"]
+
+BOOTSWATCH_DIR = normpath(@__DIR__, "..", "stylesheets", "bootswatch")
+isdir(BOOTSWATCH_DIR) || mkdir(BOOTSWATCH_DIR)
+
+function download_theme(theme)
+    theme_dir = normpath(BOOTSWATCH_DIR, theme)
+    isdir(theme_dir) || mkdir(theme_dir)
+    for target in targets
+        file = normpath(theme_dir, target)
+        isfile(file) || download("https://bootswatch.com/$(bootswatch_version)/$(theme)/$(target)", file)
+    end
+end
+
+download_theme.(themes)