## Mouse trap
### Instructions
Develop a trap to capture the elements when the mouse is getting too close to the center of the page.
Create the following functions:
- `createCircle` : make it fire on every click on the page, and create a `div` at the position of the mouse on the screen, setting its `background` to `white` and its class to `circle` .
- `moveCircle` : make it fire when the mouse moves, and get the last circle created and makes it move along with the mouse.
- `setBox` : which creates a box with the class `box` in the center of the page. When a circle is inside that box, it has to be purple (use the CSS global variable `var(--purple)` as its `background` ). Once a circle enters the box, it is trapped inside and cannot escape.
> Hint: Be careful, a circle cannot overlap the box which has walls of `1px`. It has to be trapped **strictly** inside.
### Provided files
### Files
You only need to create & submit the JS file `mouse-trap.js` ; we're providing you the following file to download and test locally:
- the HTML file [mouse-trap.html ](./mouse-trap.html ) to open in the browser, which includes:
- the JS script which will enable you to run your code.
- some CSS pre-styled classes: feel free to use those as they are, or modify them.
### Expected result
You can see an example of the expected result [here ](https://youtu.be/qF843P-V2Yw )
### Notions
- [addEventListener ](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener )
- [removeEventListener ](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener )
- [Mouse event ](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/MouseEvent )
- [click ](https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event )
- [mousemove ](https://developer.mozilla.org/en-US/docs/Web/API/Element/mousemove_event )
- [clientX ](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientX )
- [clientY ](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientY )
- [getBoundingClientRect ](https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect )
