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.
Bootstrap 3 columns with gutter.
I came up with a handy no gutters class which has some pretty basic css that you apply to your row tag holding your columns.
Bootstrap 3 tutorial bs home bs get started bs grid basic bs typography bs tables bs images bs jumbotron bs wells bs alerts bs buttons bs button groups bs glyphicons bs badges labels bs progress bars bs pagination bs pager bs list groups bs panels bs dropdowns bs collapse bs tabs pills bs navbar bs forms bs inputs bs inputs 2 bs input sizing bs.
Though you should be able to get the desired effect by setting the background on inner boxes.
To make the grid responsive there are five grid breakpoints one for each responsive breakpoint.
Bootstrap s grid system is responsive and the columns will re arrange depending on the screen size.
For example three equal columns would use three col sm 4.
All breakpoints extra small small medium large and extra large.
Column widths are in percentage so they are always fluid and sized relative to their parent element.
Bootstrap 3 switched to using padding for the gutters rather than margins so the content is parted but the boxes aren t.
Regular bootstrap version below with kittens.
And a background color will fill the padding as well.
One big advantage with flexbox is that grid columns without a.
Now here s our code for the no gutters class.