Why doesn't JS move animation work?

Question

JavaScript

The animation script on JS does not work, although I did everything the same as in the example. When you click on the button - the element must move to a certain position.
Maybe I missed something? Tell
me Link to an example: https://codepen.io/flyneex/pen/gObOwJW
Also, it's not difficult for anyone, tell me how to make this script work without pressing the button when loading the page

Answer 1

one.

.box {
    background: blue;
    width: 50px;
    height: 50px;
    position: relative;
}

2. setInterval (you have detInterval)