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Sarage2020-07-20 20:06:39
Layout
Sarage, 2020-07-20 20:06:39

When using the grid of the Bootstrap4 library, adaptation to the screen of phones, etc. does not work ... What's the problem?

<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">

    <title>Bootstrap</title>
  </head>
  <body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-primary">
      <a class="navbar-brand" href="#">Main page</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>
      </button>
      <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>
          <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
          </li>
          <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">
              Dropdown
            </a>
            <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>
            </div>
          </li>
          <li class="nav-item">
            <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
          </li>
        </ul>
        <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-light my-2 my-sm-0" type="submit">Search</button>
        </form>
      </div>
    </nav>

  <div class="container">
    <div class="row">
      <div class="col">
        <div class="card mt-5" style="width: 18rem;">
          <img src="https://art1.ru/media/photo/content/b3243f3fa20b4da84d98a67d528556.jpg" class="card-img-top" alt="...">
          <div class="card-body">
            <h5 class="card-title">Card title</h5>
            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
            <a href="#" class="btn btn-primary">Go somewhere</a>
          </div>
         </div>
      </div>
      <div class="col">
        <div class="card mt-5" style="width: 18rem;">
          <img src="https://art1.ru/media/photo/content/b3243f3fa20b4da84d98a67d528556.jpg" class="card-img-top" alt="...">
          <div class="card-body">
            <h5 class="card-title">Card title</h5>
            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
            <a href="#" class="btn btn-primary">Go somewhere</a>
          </div>
        </div>
      </div>
      <div class="col">
        <div class="card mt-5" style="width: 18rem;">
          <img src="https://art1.ru/media/photo/content/b3243f3fa20b4da84d98a67d528556.jpg" class="card-img-top" alt="...">
          <div class="card-body">
            <h5 class="card-title">Card title</h5>
            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
            <a href="#" class="btn btn-primary">Go somewhere</a>
          </div>
        </div>
      </div>
    </div>

    <div class="row">
      <div class="col">
        <div class="card mt-5" style="width: 18rem;">
          <img src="https://art1.ru/media/photo/content/b3243f3fa20b4da84d98a67d528556.jpg" class="card-img-top" alt="...">
          <div class="card-body">
            <h5 class="card-title">Card title</h5>
            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
            <a href="#" class="btn btn-primary">Go somewhere</a>
          </div>
        </div>
      </div>
      <div class="col">
        <div class="card mt-5" style="width: 18rem;">
          <img src="https://art1.ru/media/photo/content/b3243f3fa20b4da84d98a67d528556.jpg" class="card-img-top" alt="...">
          <div class="card-body">
            <h5 class="card-title">Card title</h5>
            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
            <a href="#" class="btn btn-primary">Go somewhere</a>
          </div>
        </div>
      </div>
      <div class="col">
        <div class="card mt-5" style="width: 18rem;">
          <img src="https://art1.ru/media/photo/content/b3243f3fa20b4da84d98a67d528556.jpg" class="card-img-top" alt="...">
          <div class="card-body">
            <h5 class="card-title">Card title</h5>
            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
            <a href="#" class="btn btn-primary">Go somewhere</a>
          </div>
        </div>
      </div>
    </div>
  </div>

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