Bootstrap :

Referenced list this in page header

<link rel="stylesheet"
      type="text/css"
      href="bootstrap.css"
       />

you can have as many stylesheets as you like each one can override a previous one

responsive grid

everything in divs tage in bootstrat

this is my first web page

                     Some content here for panel 1

                     Some content here for panel 2

Each panel adds up to 12 rows

create a new class called thin_border .thin_border{ border: 1px solid black; }

Introducing bootstrap