Ruby on Rails Tutorial custom CSS not showing up in app

Question

I'm running the Ruby on Rails Tutorial from Michael Hartl and my boostrap sass is working however I can not get any custom modifications to show up..

In chapter 5.5 we add the bootstrap sass gem. This is my Gem file:

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.6'
gem 'sass', '~> 3.5', '>= 3.5.5'
gem 'autoprefixer-rails', '~> 7.2', '>= 7.2.5'
gem 'bootstrap-sass', '3.3.7'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'

After bundle install I am instructed to create a custom css file under

app/assets/stylesheets/custom.scss

here we have to put the following to import bootstrap:

@import "bootstrap-sprockets";
@import "bootstrap";

but also some custom CSS that we write, so the custom.scss file looks like:

@import "bootstrap-sprockets";
@import "bootstrap";



body {
  padding-top: 60px;
}

section {
  overflow: auto;
}

textarea {
  resize: vertical;
}

.center {
  text-align: center;
}

.center h1 {
  margin-bottom: 10px;
}

/* typography */

h1, h2, h3, h4, h5, h6 {
  line-height: 1;
}

h1 {
  font-size: 3em;
  letter-spacing: -2px;
  margin-bottom: 30px;
  text-align: center;
}

h2 {
  font-size: 1.2em;
  letter-spacing: -1px;
  margin-bottom: 30px;
  text-align: center;
  font-weight: normal;
  color: #777;
}

p {
  font-size: 1.1em;
  line-height: 1.7em;
}

/* header */

#logo {
  float: left;
  margin-right: 10px;
  font-size: 1.7em;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: -1px;
  padding-top: 9px;
  font-weight: bold;
}

#logo:hover {
  color: #fff;
  text-decoration: none;
}

I restart the server and look at my app and boostrap has loaded fine but the custom CSS changes are nowhere to be found!

If i look at the souce code all the css files are compiled

<link rel="stylesheet" media="all" href="/assets/custom.self-871a674bf18d1e8205b6a321a40cf6fdedb44cd5879414e213f9011fba10d9b0.css?body=1" data-turbolinks-track="reload" />
<link rel="stylesheet" media="all" href="/assets/static_pages.self-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css?body=1" data-turbolinks-track="reload" />
<link rel="stylesheet" media="all" href="/assets/application.self-af04b226fd7202dfc532ce7aedb95a0128277937e90d3b3a3d35e1cce9e16886.css?body=1" data-turbolinks-track="reload" />

when I open the custom.cscc file I see the full bootstrap source code imported from boostrap-sass gem but my custom modifications are nowhere to be found. How can I ensure these get compiled along with bootstrap?

Playing around I realized I can't really make any modifications.. everything seems to be fixed.

I've tried restarting the server several times, refreshing, and trying different browsers (to ensure there is a clean cache).

Edit:

my application.css (the tutorial never instructs to change to .css.scss)

/*
 * This is a manifest file that'll be compiled into application.css, which
 * will include all the files listed below.
 *
 * Any CSS and SCSS file within this directory, lib/assets/stylesheets,
 * vendor/assets/stylesheets, or vendor/assets/stylesheets of plugins, if any,
 * can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear
 * at the bottom of the compiled file so the styles you add here take
 * precedence over styles defined in any styles defined in the other CSS/SCSS
 * files in this directory. It is generally better to create a new file per
 * style scope.
 *
 *= require_tree .
 *= require_self
 */

If you look at the GitHub homepage for the bootstrap-sass gem, it says you have to rename the file to .scss. Try that and see if it works. github.com/twbs/bootstrap-sass — hashrocket
– hashrocket, Commented Jan 22, 2018 at 2:26

random_user_0891 · Accepted Answer · 2018-01-22 03:08:02Z

I would rename the application.css to application.scss and then get rid of the

 *= require_tree .
 *= require_self

my application.scss looks like this. so whenever I create a new stylesheet I just go into application.scss and import it so that rails sees it.

/*
 * This is a manifest file that'll be compiled into application.css, which will include all the files
 * listed below.
 *
 * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
 * or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear at the bottom of the
 * compiled file so the styles you add here take precedence over styles defined in any styles
 * defined in the other CSS/SCSS files in this directory. It is generally better to create a new
 * file per style scope.
 *
 */

@import "bootstrap";
@import "font-awesome-sprockets";
@import "font-awesome";

/* add custom stylesheets here*/
@import "custom";
@import "sessions";
@import "users";

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