The most popular HTML, CSS, and JS library in the world

Bootstrap is a free and open-source tool collection for creating responsive websites and web applications. It is the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first websites. Nowadays, the websites are perfect for all browsers (IE, Firefox, and Chrome) and for all sizes of screens (Desktop, Tablets, Phablets, and Phones). All thanks to Bootstrap developers – Mark Otto and Jacob Thornton of Twitter, though it was later declared to be an open-source project. Bootstrap (formerly Twitter Bootstrap) is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains HTML, CSS and (optionally) JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

  • It’s important to note that this process of overriding the default CSS styles can work for both the precompiled version of Bootstrap and the source code version.
  • A network administrator manages the BOOTP server, which assigns the IP address automatically from a pool of addresses for a specific duration.
  • Popper is a positioning engine for calculating elements’ positioning.
  • Use any of these color variables as they are or reassign them to more meaningful variables for your project.
  • Adding the .img-responsive class will automatically resize images based on the users’ screen size.
  • With this class, you don’t have to keep repeating these CSS properties in your stylesheet to format every single button you add.

If you’ve loaded the compiled JS onto your site, you can also add a dismiss button to let visitors close the alert once they’ve read it. To load Bootstrap JavaScript, add the following line of code right after the call for jQuery. Below let’s look at how you can use the precompiled Bootstrap to build a website. You can also take several steps to reduce that weight and mitigate its impact on load time.

You want to master HTML and CSS.

Bootstrap offers HTML and CSS templates, or “examples,” to help you start building your site quickly. Bootstrap CSS is the leading CSS framework for developing responsive and mobile-first websites. It makes it possible for a web page or app to detect the visitor’s screen size and orientation and automatically adapt the display accordingly.

With the four tiers of grids available you’re bound to run into issues where, at certain breakpoints, your columns don’t clear quite right as one is taller than the other. To fix that, use a combination of a .clearfix and our responsive utility classes. Bootstrap requires a containing element to wrap site contents and house our grid system.

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The source code version includes the precompiled CSS, JS, and font assets as well as source files for the CSS, JS, and icon fonts respectively. If you want to customize the CSS and JS files included in Bootstrap as you please, then you’ll be better off downloading the source code version. Another reason Bootstrap is so popular is that it’s easy to use.

what is bootstrap css

You can walk through the development process step-by-step in How to Create a Carousel Slider for Your Website in Bootstrap CSS. We’ve already touched on a few examples above, including the Navbar. Below we’ll take a closer look at a few additional examples. Now that we understand what Bootstrap CSS is and who should be using it, let’s briefly discuss the different download options you have.

Add .initialism to an abbreviation for a slightly smaller font-size.

Let’s walk through adding one component — a navigation bar — step-by-step so you understand how to use Bootstrap. Once set up, however, you can change and customize the files any way you want. If you choose to download the Bootstrap source code, then you’ll what is bootstrap used for unzip the folder and see the following structure. Since Bootstrap comes with pre-styled content, components, and templates, Bootstrap sites tend to look the same out-of-the-box. In fact, Bootstrap has been blamed for why websites today all look the same.

what is bootstrap css

Bootstrap includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases. It includes predefined classes for easy layout options, as well as powerful mixins for generating more semantic layouts. Bootstrap is a free and open-source web development framework. It’s designed to ease the web development process of responsive, mobile-first websites by providing a collection of syntax for template designs. Bootstrap is developed mobile first, a strategy in which we optimize code for mobile devices first and then scale up components as necessary using CSS media queries.

What is bootstrapping in general terms?

Note that the @link-hover-color uses a function, another awesome tool from Less, to automagically create the right hover color. Easily style your links with the right color with only one value. Use a single or combination of the available classes for toggling content across viewport breakpoints. To center images which use the .img-responsive class, use .center-block instead of .text-center. See the helper classes section for more details about .center-block usage.

what is bootstrap css

Visit the Sass port’s GitHub repository to see these files in action. Since the Sass port has a separate repo and serves a slightly different audience, the contents of the project differ greatly from the main Bootstrap project. This ensures the Sass port is as compatible with as many Sass-based systems as possible. Easily configure the resize options for any textarea, or any other element.

What Bootstrap package contains

This raw form is modular, meaning that the developer can remove unneeded components, apply a theme and modify the uncompiled Sass files. It’s important to note that this process of overriding the default CSS styles can work for both the precompiled version of Bootstrap and the source code version. With the latter however, you can also directly edit the Bootstrap SASS source code if you have experience with SASS. In order to use Bootstrap CSS, you need to integrate it into your development environment. To do that, you simply need to create a folder on your computer. In that folder, save your compiled CSS and JS files and a new HTML file where you’ll load Bootstrap.

Then you can use Bootstrap templates to add interface elements to the page. The dist/ folder contains everything listed in the precompiled section above. The docs/ folder includes the source code for Bootstrap documentation and examples of Bootstrap usage. The js/ folder contains the source code for Bootstrap JS and the scss/ folder for Bootstrap CSS.

When you download the Bootstrap framework, aspects of your site’s appearance will change automatically, like the typography. But you still have to write the HTML and plug in the preset layouts, colors, and components you need to make up your website. Though Bootstrap does simplify the process of building a site, you’ll have to be familiar with HTML and CSS to use the framework. For example, understanding the CSS box model will be important when using the container class and building your first Bootstrap grid.