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並前往http://www.appstraptheme.com/appstrap3.1.3/theme/elements-spacers.html

Spacers | AppStrap Bootstrap Theme by Themelize.me

Bootstrap 4 added some very useful spacer utilities to allow you to set ... .mt-3 = margin top 1rem .mt-4 = margin top 1.5rem .mt-5 = margin top 3rem ...

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