To make the grid responsive there are five grid breakpoints one for each responsive breakpoint.
Bootstrap add gutter between columns.
For example three equal columns would use three col sm 4.
All breakpoints extra small small medium large and extra large.
Bootstrap s grid system is responsive and the columns will re arrange depending on the screen size.
That padding is offset in rows for the first and last column via negative margin on rows.
We can size our columns with 50 of the width of the viewport for the first div.
Gutters let us add padding between columns.
On a big screen it might look better with the content organized in three columns but on a small screen it would be better if the content items were stacked on top of each other.
Columns have horizontal padding to create the gutters between individual columns however you can remove the margin from rows and padding from columns with no gutters on the row.
Grid columns are created by specifying the number of 12 available columns you wish to span.
Though you should be able to get the desired effect by setting the background on inner boxes.
Columns create gutters gaps between column content via padding.
We can use it to space and align content.
Bootstrap 3 switched to using padding for the gutters rather than margins so the content is parted but the boxes aren t.
For example we can write.