1, I used vue to build a responsive page, using bootstrap, but wanted to use a column offset effect, using col-offset, but did not work, and then I tried col-push col-pull, without solving it. But there is a grid effect, and the code is as follows I also set up a code like demo, and the effect is there, but it won"t work if I put it here 
tried various methods but failed to implement, want to know how to solve
in vue global installation bootstrap, the version used is the latest version of bootstrap4, in which the column offset is written as offset-md-x has changed compared with the previous writing, and the previous writing method has no effect
check whether the parent is not wide enough;
check the actual style. Don't try. Don't guess.
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