Bootstrap 4 pull right is invalid [How to Solve]


 *                   bootstrap 4 pull-right is invalid
 * Description.
 * When testing bootstrap, I found that pull-right is invalid, but it turns out that it has been replaced with float-right.

I. Reference documents.
    1. What happened to the .pull-left and .pull-right classes in Bootstrap 4?
    2. pull-right replacement in bootstrap 4 does not work

II. Solutions.
    The classes are currently float-right float-sm-right etc.

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