diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
new file mode 100644
index 00000000..ba844b97
--- /dev/null
+++ b/.github/workflows/ruby.yml
@@ -0,0 +1,32 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: Ruby
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['2.6', '2.7', '3.0']
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run tests
+      run: bundle exec rake
diff --git a/lib/colorls.rb b/lib/colorls.rb
index 57f369db..33a350d2 100644
--- a/lib/colorls.rb
+++ b/lib/colorls.rb
@@ -5,6 +5,7 @@
 require 'English'
 require 'filesize'
 require 'io/console'
+require 'io/console/size'
 require 'rainbow/ext/string'
 require 'clocale'
 require 'unicode/display_width'
diff --git a/lib/colorls/core.rb b/lib/colorls/core.rb
index 5ec1f3e8..b7300b82 100644
--- a/lib/colorls/core.rb
+++ b/lib/colorls/core.rb
@@ -8,8 +8,17 @@ def self.file_encoding
     @file_encoding
   end
 
-  @screen_width = IO.console.winsize[1]
-  @screen_width = 80 if @screen_width.zero?
+  def self.terminal_width
+    console = IO.console
+
+    width = IO.console_size[1]
+
+    return width if console.nil? || console.winsize[1].zero?
+
+    console.winsize[1]
+  end
+
+  @screen_width = terminal_width
 
   def self.screen_width
     @screen_width