What's a great looking responsive multiselect solution?

1. How do you use multi select?
2. How does multiselect dropdown work?

How do you use multi select?

Multiple items are selected by holding down SHIFT and clicking them with the mouse or by holding down SHIFT and pressing an arrow key to extend the selection from the previously selected item to the current item.

How does multiselect dropdown work?

Multi select dropdown list is used when a user wants to store multiple values for the same record, whereas dropdown list is used to store a single value for a record. You can create custom categories of either dropdown list or multi select dropdown list and define items in each category.