Try resizing this responsive page to see the effect! Compare it in the broser on your laptop and on your phone as well!!
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The .img-responsive class makes the image scale nicely to the parent element (resize the browser window to see the effect):
This is the first column
Notice the sum of the containers is 12 for any container
This is the middle column
It contains some more text
This is the right most column
Play around with adding more columns but make sure you remember:
The sum across any row must add up to 12!