diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f4fc75a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,20 @@
+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  format_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: lua format check
+        uses: JohnnyMorganz/stylua-action@1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --color always --check lua/
+
diff --git a/.stylua.toml b/.stylua.toml
new file mode 100644
index 0000000..609d773
--- /dev/null
+++ b/.stylua.toml
@@ -0,0 +1,5 @@
+column_width = 100
+line_endings = "Unix"
+indent_type = "Spaces"
+indent_width = 2
+quote_style = "AutoPreferDouble"
diff --git a/lua/docs-view.lua b/lua/docs-view.lua
index a2877c4..719f0bc 100644
--- a/lua/docs-view.lua
+++ b/lua/docs-view.lua
@@ -1,7 +1,7 @@
 local M = {}
 local config = {
   position = "right",
-  width = vim.api.nvim_get_option("columns") / 3,
+  width = 40,
 }
 
 M.setup = function(conf)