To make the full size div in bootstrap, you need to use the container-liquid class. You can get a full-sized image of the div based on the width of the page using the following code.
<div class="container-fluid" style="padding: 0"> <div class="banner img-responsive" style="background-image: url('http://res.cloudinary.com/dhlsxlkrc/image/upload/v1447118604/spring-purple-flowers-1080p-hd_dg4ncq.jpg'); height: 400px;"> </div>
So put this code where you have <div class="full"></div>
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