I need a border animation using css or js

https://www.youtube.com/watch?v=zFimhFbPpRs&ab_channel=OnlineTutorials I need animation something like this, however, in the video, the border seems animated from two directions, I need the border to keep moving from one direction until reaching the endpoint. This is the animation it requested, but actually, the animation is needed in `before` pseudocode instead of the border itself. You can ask for the URL if you want.