The period isn't supported by the mobile end, only pc and pad are supported.
Later adds support for mobile end support.
In the early days, 【 should be able to plan the style of the project, and it's easy to maintain 】.
Is the number of pages less than 10, it's necessary to do a set of UI styles that meet your project 's 【 bootstrap 】.
Or, depending on the psd design, it's to reuse.
I'm doing this now:
Write a common style ( reset, global style, layout, font style, form, button, color ) + a special style. Css.
It's a bit confusing, because some of them don't know where it should be.