To transition from one css value to another, you can use the
In your element, set the value you want to transition, with the time taken to do such:
transition: flex-basis 0.3s; for example.
And the change
flex-basis value somehow to see the transition, usually by changing either class or style property of an element.
You can change the type of transition by setting the
transition-timing-function attribute: to
ease-in-out for example.