Introdução

Descubra o Bootstrap, o framework mais conhecido do mundo para criar sites responsivos e mobile, comece com o BootstrapCDN e nosso template inicial.

Visão rápida

Tentando adicionar rapidamente o Bootstrap ao seu projeto? Use o BootstrapCDN, fornecido gratuitamente pelo pessoal da MaxCDN. Usando um gerenciador de pacotes ou precisa do código fonte? Vá para a página de downloads.

CSS

Copie e cole o arquivo de estilo <link> dentro da sua <head> antes de todos os outros arquivos de estilo para carregar nosso CSS.

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">

JS

Muitos dos nossos componentes precisam de JavaScript para funcionar. Mais especificamente, eles precisam do jQuery, Popper.js e do nossos próprios plugins JavaScript. Coloque os seguintes <script>s perto do final da sua página, logo antes do fechamento da tag </body>. jQuery tem que vir antes, depois o Popper.js e só depois nossos plugins JavaScript.

Nós usamos a build slim do jQuery, mas a versão completa também é suportada.

<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/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>

Curiosidade para saber quais componentes precisam de jQuery, nosso JS e Popper,js? Clique em “Mostrar componentes dependentes de JavaScript” logo abaixo. Se ainda tem dúvidas sobre a estrutura da página em geral, continue lendo para um templete de exemplo de página.

Mostrar componentes dependentes de JavaScript
  • Alerts for dismissing
  • Buttons for toggling states and checkbox/radio functionality
  • Carousel for all slide behaviors, controls, and indicators
  • Collapse for toggling visibility of content
  • Dropdowns for displaying and positioning (also requires Popper.js)
  • Modals for displaying, positioning, and scroll behavior
  • Navbar for extending our Collapse plugin to implement responsive behavior
  • Tooltips and popovers for displaying and positioning (also requires Popper.js)
  • Scrollspy for scroll behavior and navigation updates

Template inicial

Tenha certeza de configurar suas páginas com padrões recentes de desenvolvimento e design. Ou seja, utilizando HTML5 doctype e a meta tag viewport para proporcionar o funcionamento responsivo adequado. Feito isto, suas páginas devem ficar assim:

<!doctype html>
<html lang="pt-br">
  <head>
    <!-- Meta tags Obrigatórias -->
    <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/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">

    <title>Olá, mundo!</title>
  </head>
  <body>
    <h1>Olá, mundo!</h1>

    <!-- JavaScript (Opcional) -->
    <!-- jQuery primeiro, depois Popper.js, depois Bootstrap JS -->
    <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/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>
  </body>
</html>

No geral, são esses os requisitos para o funcionamento da página. Visite a Documentação de Layout ou nossos exemplos oficiais para começar a incluir conteúdos e componentes em seu site.

Importância geral

Bootstrap employs a handful of important global styles and settings that you’ll need to be aware of when using it, all of which are almost exclusively geared towards the normalization of cross browser styles. Let’s dive in.

HTML5 doctype

Bootstrap requires the use of the HTML5 doctype. Without it, you’ll see some funky incomplete styling, but including it shouldn’t cause any considerable hiccups.

<!doctype html>
<html lang="en">
  ...
</html>

Meta tag responsiva

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. To ensure proper rendering and touch zooming for all devices, add the responsive viewport meta tag to your <head>.

<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

You can see an example of this in action in the starter template.

Box-sizing

For more straightforward sizing in CSS, we switch the global box-sizing value from content-box to border-box. This ensures padding does not affect the final computed width of an element, but it can cause problems with some third party software like Google Maps and Google Custom Search Engine.

On the rare occasion you need to override it, use something like the following:

.selector-for-some-widget {
  box-sizing: content-box;
}

With the above snippet, nested elements—including generated content via ::before and ::after—will all inherit the specified box-sizing for that .selector-for-some-widget.

Learn more about box model and sizing at CSS Tricks.

Reinicialização

For improved cross-browser rendering, we use Reboot to correct inconsistencies across browsers and devices while providing slightly more opinionated resets to common HTML elements.

Comunidade

Stay up to date on the development of Bootstrap and reach out to the community with these helpful resources.

  • Follow @getbootstrap on Twitter.
  • Read and subscribe to The Official Bootstrap Blog.
  • Join the official Slack room.
  • Chat with fellow Bootstrappers in IRC. On the irc.freenode.net server, in the ##bootstrap channel.
  • Implementation help may be found at Stack Overflow (tagged bootstrap-4).
  • Developers should use the keyword bootstrap on packages which modify or add to the functionality of Bootstrap when distributing through npm or similar delivery mechanisms for maximum discoverability.

You can also follow @getbootstrap on Twitter for the latest gossip and awesome music videos.