Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile-first projects on the web.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit...
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris...
Lorem ipsum dolor sit amet, consectetur adipisicing elit...
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris...
The .img-responsive class makes the image scale nicely to the parent element (resize the browser window to see the effect):