Bootstrap was conceived by Mark Otto and Jacob Thornton, who were working at Twitter in 2010. The project was released in 2011 as open source. Since then Bootstrap has become a highly popular framework due to its ease of use and ability to deliver cross-platform compatibility between many browsers and devices.
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
Bootstrap is designed to be responsive to mobile devices. Mobile-first styles are part of the core framework.
To ensure proper rendering and touch zooming, add the following <meta> tag inside the <head> element:
<meta name="viewport" content="width=device-width, initial-scale=1">
The width=device-width part sets the width of the page to follow the screen-width of the device (which will vary depending on the device).
The initial-scale=1 part sets the initial zoom level when the page is first loaded by the browser.
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