xxxxxxxxxx<html lang="en"><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1"><title>Example of Bootstrap 3 Nested Rows and Columns</title><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"><script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script><script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script><style type="text/css"> /* Some custom styles to beautify this example */ .main-content{ min-height: 330px; background: #dbdfe5; } .sidebar-content{ min-height: 150px; margin-bottom: 30px; background: #b4bac0; }</style></head><body> <!-- Open the output in a new blank tab (Click the arrow next to "Show Output" button) and resize the browser window to understand how the Bootstrap responsive grid system works. -->