This is because the viewport width is in pixels and does not change with the font size.
Change gutter bootstrap 4.
There are a lot of changes from its previous versions in terms of bootstrap components and visual appearances.
We actually ended up just downloading the bootstrap source unzipping it copying the source scss files into the assets folder then importing the bootstrap scss file in index js instead of the final bootstrap css file.
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The bootstrap 4 grid system has five classes col extra small devices screen width less than 576px col sm small devices screen width equal to or greater than 576px col md medium devices screen width equal to or greater than 768px col lg large devices screen width equal to or greater than 992px col xl xlarge devices screen width equal to or greater than 1200px.
With its latest version bootstrap 4 4 1 currently in live bootstrap 4 is a major rewrite of its previous version.
Specify your own gutters for every breakpoint.
Thanks for the response.
Same as arajay s answer but with some automation that gives a possibility to choose a specific gutter width for every breakpoint.
While bootstrap uses ems or rems for defining most sizes pxs are used for grid breakpoints and container widths.
Bootstrap 4 has been in alpha for almost 2 years.