One big advantage with flexbox is that grid columns without a.
Bootstrap 3 columns with gutter.
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.
Bootstrap s grid system is responsive and the columns will re arrange depending on the screen size.
Recently i had a need to have a default grid in bootstrap but also on the homepage i needed to have 4 boxes that butted right up against each other.
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.
Though you should be able to get the desired effect by setting the background on inner boxes.
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.
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.
Now here s our code for the no gutters class.
All breakpoints extra small small medium large and extra large.
Regular bootstrap version below with kittens.
The biggest difference between bootstrap 3 and bootstrap 4 is that bootstrap 4 now uses flexbox instead of floats.
For example three equal columns would use three col sm 4.