What you need to know is that columns don't have a fixed width: they can vary based on the resolution of the screen, or the size of the window (try scaling down this window to see what we mean). Design with that in mind.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc. Phasellus dolor arcu, egestas non venenatis sit amet, convallis vitae nulla.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc. Phasellus dolor arcu, egestas non venenatis sit amet.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc. Phasellus dolor arcu, egestas non venenatis sit amet, convallis vitae nulla.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc. Phasellus dolor arcu, egestas non venenatis sit amet, convallis vitae nulla.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc. Phasellus dolor arcu, egestas non venenatis sit amet, convallis vitae nulla.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eros sapien, laoreet eget aliquam nec, egestas a eros. Ut ullamcorper elit velit, nec pretium nunc.
For example, the following text should describe the device you're using: You are on a desktop machine.You are on a tablet device.You are on a smartphone like an iPhone or Android phone.
Cloud CMS 智能云端信息发布系统
This example uses the opposite rules, so the following text should describe the device you're using: You are not on a desktop machine.You are not on a tablet device.You are not on a smartphone like an iPhone or Android phone.
Each of these classes have an implied 'only' as in 'show only on tablet' or 'hide only on phones'.
Most of the documentation is by the Zurb Team. It's awesome & I'm thankful that they wrote such thorough documentation for an open source project. Most companies would never do that.