[RAILS] [Beginner] I tried to decorate the bar after displaying the details of the hamburger menu

* This article was written by a programming beginner. Please point out any mistakes.
This time I will write about how to design a list of navigators when you click on the hamburger menu.


Define the model name as posts.
The framework is Ruby on Rails.

Bootstrap is a super convenient function that automatically designs the minimum design just by writing HTML. Be sure to write it down!


    <title>Any title</title>
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>
    <link href="sp.css" rel="stylesheet" type="text/css" media="screen and (min-width: 992px)" />
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.14.0/css/all.css">

    <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">


     <div class='main-font'>
      <%= yield %>
   <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
   <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>


① Write HTML

First, create a hamburger menu using Bootstrap article .


<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>

At this stage, I don't think there is a navigator design after clicking the hamburger.

② Apply CSS

7th line of the above code
 <div class="collapse navbar-collapse" id="navbarSupportedContent">

Write CSS in the class of.


@media screen and (max-width: 992px) {
    padding: 10%;
    border-radius: 10px 10px 10px 10px;
    background: linear-gradient(white, #cccccc) !important;
    margin: 15%;
    font-size: 1.7rem;

@media screen and (max-width: 992px) {
  //For smartphones
    padding: 10%;
    border-radius: 10px 10px 10px 10px;
    background: linear-gradient(white, #cccccc) !important;
    margin: 15%;
    font-size: 1.7rem;

Explanation of ②

Q. Even though the class is collapse navbar-collapse Why do I need to write the same properties and values ​​as an undefined selector?
A. The second selector shows the CSS while the display screen is moving. Bootstrap automatically implements a dynamic design, so "when the display screen is moving" and "after the operation after clicking is completed" You have to write it separately. You can check what the selector is in action with
developer tools . I'm sure the class name in action has changed.

Thank you for reading! !!

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