Difference between bootstrap.css and bootstrap-theme.css

Bootstrap is an HTML, CSS and JS front-end-framework used for developing responsive and mobile-first projects on the web. It is the framework that comes up with predefined terms, thus giving you the ability to use these codes instead of having to create the codes from scratch. It is a collection of HTML, CSS and JS code that is designed to help build user interface components. It has several versions the latest one is 4.4.1 released on November 28, 2019.

Bootstrap is easy to use either we download from the official website using this link or, we can just copy the written code from the official website provided for free.
Bootstrap CDN is the public content delivery network that enables users to load CSS or js and images remotely from its server. Bootstrap CDN contains the following features:

  • Easy to use with basic knowledge of the HTML, we can start using Bootstrap.
  • Simple integration: Bootstrap can be simply integrated along with distinct other platforms and frameworks, on existing sites and new ones too and one more thing you can also utilize particular elements of Bootstrap along with your current CSS.
  • Great Grid System: Bootstrap is built on responsive 12-column grids, layouts, and components. Whether you need a fixed grid or a responsive, it’s only a matter of a few changes.

Example: The sample code for dividing a webpage into three columns where the bootstrap is used directly without creating new methods that are available on the official website. (source: https://getbootstrap.com/docs/4.4/getting-started/introduction/)



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<!DOCTYPE html>
<html>
  
<head>
    <link rel="stylesheet" href=
        integrity=
"sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh"
        crossorigin="anonymous">
</head>
  
<body>
    <div class="container">
        <div class="row">
            <div class="col-md">
                n One of three columns
            </div>
              
            <!-- Dividing the website into
                three columns -->
            <div class="col-md">
                One of three columns
            </div>
  
            <div class="col-md">
                One of three columns
            </div>
        </div>
    </div>
</body>
  
</html>

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Output:

Problems with bootstrap: There will be a lot of overriding of files where more time is spent on designing a website. we need to spend a bit more time creating a design otherwise most of the webpages look the same. JS is tied to jquery and is one of the common libraries which thus leaves most of the plugins unused.

Introduction to Bootstrap-Theme: Bootstrap themes are packages of HTML, CSS, and js that provide styling, UI components, and page layouts to use in a web project. The templates are already written by the developer which is used to adapt the script and easy learning of an individual for building a new website.

Features: Bootstrap-theme includes buttons, dropdown menu, navbar, progress bar, panels. The terms classes allow us to access specific elements of CSS and JS via class selectors. The classes in buttons which are predefined save a lot of time can be customizable. The themes used to set the height of the grid and background color to the webpage with different style formatting of the text and with content and height of the text we can set the padding of the grid. Container-fluid to create fluid layouts to utilize the 100% width of the viewport across all devices.

Example:

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<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>Bootstrap Example</title>
    <meta charset="utf-8">
    <meta name="viewport" 
          content="width=device-width, initial-scale=1">
    <link rel="stylesheet" 
          href=
    <script src=
  </script>
    <script src=
  </script>
    <style>
        /* Remove the navbar's default margin-bottom
           and rounded borders */
          
        .navbar {
            margin-bottom: 0;
            border-radius: 0;
        }
        /* Add a gray background color and some
           padding to the footer */
          
        footer {
            background-color: #f2f2f2;
            padding: 25px;
        }
          
        .carousel-inner img {
            width: 100%;
            /* Set width to 100% */
            margin: auto;
            min-height: 200px;
        }
        /* Hide the carousel text when the screen
           is less than 600 pixels wide */
          
        @media (max-width: 600px) {
            .carousel-caption {
                display: none;
            }
        }
    </style>
</head>
  
<body>
  
    <nav class="navbar navbar-inverse">
        <div class="container-fluid">
            <div class="navbar-header">
                <button type="button" 
                        class="navbar-toggle" 
                        data-toggle="collapse" 
                        data-target="#myNavbar">
                    <span class="icon-bar">
                  </span>
                    <span class="icon-bar">
                  </span>
                    <span class="icon-bar">
                  </span>
                </button>
                <a class="navbar-brand" 
                   href="#">Logo</a>
            </div>
            <div class="collapse navbar-collapse" 
                 id="myNavbar">
                <ul class="nav navbar-nav">
                    <li class="active"><a href="#">Home</a></li>
                    <li><a href="#">About</a></li>
                    <li><a href="#">Projects</a></li>
                    <li><a href="#">Contact</a></li>
                </ul>
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">
                      <span class="glyphicon glyphicon-log-in">
                      </span> Login</a></li>
                </ul>
            </div>
        </div>
    </nav>
  
    <div id="myCarousel" 
         class="carousel slide" 
         data-ride="carousel">
        <!-- Indicators -->
        <ol class="carousel-indicators">
            <li data-target="#myCarousel" 
                data-slide-to="0" 
                class="active"></li>
            
            <li data-target="#myCarousel" 
                data-slide-to="1"></li>
        </ol>
  
        <!-- Wrapper for slides -->
        <div class="carousel-inner" role="listbox">
            <div class="item active">
                <img alt="Image">
                <div class="carousel-caption">
                    <h3>SomeText</h3>
                    <p>content.</p>
                </div>
            </div>
  
            <div class="item">
                <img alt="Image">
                <div class="carousel-caption">
                    <h3>Mo</h3>
                    <p>Lorem ipsum...</p>
                </div>
            </div>
        </div>
  
        <!-- Left and right controls -->
        <a class="left carousel-control"
           href="#myCarousel" 
           role="button"
           data-slide="prev">
            <span class="glyphicon glyphicon-chevron-left" 
                  aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="right carousel-control" 
           href="#myCarousel" 
           role="button" 
           data-slide="next">
            <span class="glyphicon glyphicon-chevron-right" 
                  aria-hidden="true">
          </span>
            <span class="sr-only">Next</span>
        </a>
    </div>
  
    <div class="container text-center">
        <h3>What We Do</h3>
        <br>
        <div class="row">
            <div class="col-sm-4">
                <img class="img-responsive" 
                     style="width:100%"
                     alt="Image">
                <p>Current Project</p>
            </div>
            <div class="col-sm-4">
                <img class="img-responsive"
                     style="width:100%"
                     alt="Image">
                <p>Project 2</p>
            </div>
            <div class="col-sm-4">
                <div class="well">
                    <p>Some text..</p>
                </div>
                <div class="well">
                    <p>Some text..</p>
                </div>
            </div>
        </div>
    </div>
    <br>
  
    <footer class="container-fluid text-center">
        <p>Footer Text</p>
    </footer>
  
</body>
  
</html>

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Output:

Problems with Bootstrap-theme: The terms should be remembered while writing the code no errors will be displayed, we should recheck the code for getting the correct output. Every term should be specified for styling a website.

Difference: Bootstrap.css framework is used for designing a basic webpage with some context and predefined designs. The styling of the website is done by importing the CSS link in the official website. As in bootstrap-theme.css is used for dropdown menus, navigation bars, progress bars, buttons with different styles we can add them by calling class attributes in the code. Formatting the text with different styles, sliding of text on the website.

We can add animations to images on the website and the social media buttons by icons for sharing the content on the website. we have predefined classes on the package we need to call the attributes for the styling of buttons.




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