Use Bootstrap

Gemfile

@@ -50,3 +50,6 @@ end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+
+gem 'bootstrap', github: 'twbs/bootstrap-rubygem'
+gem 'jquery-rails'

Gemfile.lock

@@ -1,3 +1,12 @@
+GIT
+  remote: https://github.com/twbs/bootstrap-rubygem.git
+  revision: 7cdeca9a0e8db3bb7548d9fa5bdaad9b644fca32
+  specs:
+    bootstrap (4.0.0.alpha6)
+      autoprefixer-rails (>= 6.0.3)
+      popper_js (>= 1.9.9, < 2.0)
+      sass (>= 3.4.19)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -41,6 +50,8 @@ GEM
     addressable (2.5.1)
       public_suffix (~> 2.0, >= 2.0.2)
     arel (8.0.0)
+    autoprefixer-rails (7.1.1.3)
+      execjs
     bindex (0.5.0)
     builder (3.2.3)
     byebug (9.0.6)
@@ -70,6 +81,10 @@ GEM
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
+    jquery-rails (4.2.2)
+      rails-dom-testing (>= 1, < 3)
+      railties (>= 4.2.0)
+      thor (>= 0.14, < 2.0)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -88,6 +103,7 @@ GEM
     nio4r (2.1.0)
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
+    popper_js (1.9.9)
     public_suffix (2.0.5)
     puma (3.9.1)
     rack (2.0.3)
@@ -169,10 +185,12 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  bootstrap!
   byebug
   capybara (~> 2.13)
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
+  jquery-rails
   listen (>= 3.0.5, < 3.2)
   puma (~> 3.7)
   rails (~> 5.1.2)

app/assets/javascripts/application.js

@@ -12,4 +12,7 @@
 //
 //= require rails-ujs
 //= require turbolinks
+//= require jquery3
+//= require popper
+//= require bootstrap-sprockets
 //= require_tree .

app/assets/stylesheets/application.scss

@@ -0,0 +1 @@
+@import "bootstrap";