The class "col-md-4" instructs Bootstrap to make the content four columns wide, and "col-md-offset-4" tells Bootstrap to offset it by four columns, thus centering it. See Figure 6 for a rough overlay ...

Then I found out a quick and easy way to resize images with CSS by keeping your image’s aspect ratio. ... Second class will resize the images by keeping height as 300 pixels.

The percent-# class specifics the percentage width of the parent container an image should be. For example, percent-30 will make an image 30% the width of the parent. Percent classes can be applied in ...