Bootstrap: Play With Grid System (Part One)

According to Bootstrap, grid systems are used for creating page layouts through a series of rows and columns that house your content. Bootstrap includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases.

There are four main grid sizes:

Extra Small devices (col-xs-): phone
Small devices (col-sm-): tablet
Medium devices (col-md-): desktops
Large devices (col-lg-): desktops

The instructor shows us how to build a responsive grid system.

After we link the bootstrap css file, we are going to create the grid system on the body part. Since grid systems only scale up to 12 columns, we can create layouts in different units.

In the HTML, we create a "container" first, so the grid system will be inside the container.

Then we create a class attribute value equal "row" in the div tag, so all units will stay in one row just like the table data stay in the table row. And each row scales 12 columns (units).

In the first row, we create three cells. The first cell and the last cell have the same size and units which are "col-lg-2". It means that each cell is large size and scales two columns. The middle cell is also large size but scales 8 columns. The sum of these three cell columns is 12.

For the second row, we create three same size and unit cells. They are all large size, and each will take four units.

In order to compare these two rows, I assign them in different colors in the CSS. The first row is pink, and the second row is orange.

The result:

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