Horizontal scrollbars are usually caused by using the Bootstrap grid incorrectly.
The solution proposed by Ben Goossens is a hack and should be avoided because it makes the use of Bootstrap pointless. Use Bootstrap as intended and you won't need any hacks or custom css gymnastics.
Here's what you need:
1) .container div
2) .row div
3) .col div
That's the "holy trinity" you need in order for the Bootstrap grid to work properly.
Always put all of your normal content into Bootstrap columns (which in turn go into a row, which goes into a container) and you won't have any horizontal scrollbar issues.
The Bootstrap rows are designed to work with columns together. If you leave one of those 2 out, you're gonna run into issues.
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