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If you're using Bootstrap 3, you can use the embed-responsive class and set the padding bottom as the height divided by the width plus a little extra for toolbars. For example, to display an 8.5 by 11 PDF, use 130% (11/8.5) plus a little extra (20%).
How it works. Assign responsive-friendly margin or padding values to an element or a subset of its sides with shorthand classes. Includes support for individual properties, all properties, and vertical and horizontal properties. Classes are built from a default Sass map ranging from .25rem to 3rem.
Images. Documentation and examples for opting images into responsive behavior (so they never become larger than their parent elements) and add lightweight styles to them—all via classes. Responsive images. Images in Bootstrap are made responsive with .img-fluid.
img { border-radius: 50%; } Try it Yourself » Thumbnail Images. Use the border property to create thumbnail images. Thumbnail Image: Example. img { border: 1px solid #ddd; border-radius: 4px; padding: 5px; width: 150px; } <img src="paris.jpg" alt="Paris"> Try it Yourself » Thumbnail Image as Link: Example. img { border: 1px solid #ddd;
Images in Bootstrap 3 can be made responsive-friendly via the addition of the .img-responsive class. This applies max-width: 100%; , height: auto; and display: block; to the image so that it scales nicely to the parent element.
Bootstrap image grid is a simple construction that allows you to create a responsive layout for your images. Basic example Use .row and .col to create a grid.
To make your image look like a thumbnail use the .img-thumbnail class on the image. It creates a border, adds padding, rounds the image, and makes it responsive. With the .img-thumbnail class, you need not add the .img-fluid class to make an image responsive. The Bootstrap's .img-thumbnail CSS class properties are:
