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Use Media Queries
Sth like
@media (max-width:600px) { .facet_sidebar { display: none; } }
You do that by Using CSS Media Queries, you create all breakpoints that you need in pixels to make your changes.
Check this article it will help you to how to use it:
How to create media queries in Responsive Web Design
If you need a refrence for Responsive design device resolution, check this out:
Responsive design device resolution reference
And check this tool, it helps you to test your websites in many viewports (it also gives you exact viewport for common devices) :
