What is the best place in Rails to add @media CSS tags?

Currently, my layout.html.erb contains some CSS rules with @media queries.

<style>
 @media (max-width: 900px) {
    .green-button{
      display: none!important;
    }
    .chat_button{
      margin-top: 20px!important;
    }
    #myCarousel{
      height:800px!important;
    }
</style>

I decided to move these rules into a separate CSS file called mobile.css in my css folder. However, the styles are not taking effect. How can I resolve this issue?

Answer №1

Ensuring your CSS is well-organized is crucial when working with Rails.

To manage your stylesheets effectively, create a main

app/assets/stylesheets/application.css
file where you can specify all the CSS files to import for your application.

For example, if you have a separate

app/assets/stylesheets/mobile.css
file, you should include the following in your application.css:

/*
*= require mobile
*/

Next, make sure to include the following code within the <head> tags on your page:

<%= stylesheet_link_tag 'application', media: 'all' %>

For more guidance on how to organize assets in Rails, refer to the following link: http://guides.rubyonrails.org/asset_pipeline.html#asset-organization

Here are some suggestions:

  • Avoid mixing camelCase and dashes in your CSS.
  • Avoid assigning styles to IDs.
  • Minimize the use of !important.

Stick to using classes instead of IDs for styling, and opt for dashes (-) over camelCase. Try to limit the use of !important, and consider referring to a CSS style guide for best practices.

Additionally, consider transitioning to SCSS for improved functionality. Rename your mobile.css to mobile.scss and structure it like this:

$breakpoint: 900px;
@media (max-width: $breakpoint) {

  .green-button {
    display: none !important;
  }

  .chat_button{
    margin-top: 20px !important;
  }

  #myCarousel {
    height:800px !important;
  }

Answer №2

Insert these styles into your application.css:

#app/assets/stylesheets/application.css
@media (max-width: 900px) {
  .green-button { display: none; }
  .chat_button  { margin-top: 20px; }
  #myCarousel   { height:800px; }
}

I made a new file called mobile.css

You may not necessarily require a separate "mobile" stylesheet if you utilize @media queries.

@media queries adjust the appearance of your website depending on the size of the screen. With mobile devices having varying viewport sizes, creating an entirely different CSS structure might be unnecessary.

The idea of a "mobile" stylesheet originated from the time when mobile Internet was limited in functionality. Nowadays, with advanced HTML support on phones, it's more about adapting the size and visibility of elements.

In Rails, the default recommendation is to incorporate the @media queries within your application.css, which should be linked in your layout:

#app/views/layouts/application.css
<%= stylesheet_link_tag :application %>

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