Not left buttons

Question

https://code.sololearn.com/W6a10a134A20/?ref=app
So, both of my buttons end up making the "player" go to the right, even though my left butto says to make it go backwards, or to the left. i tested it with console logs, so the buttons are seperate, but left just doesn't work right.
Where did i to wrong, and what do i change to make it work right?

Answer 1

one quick dirty fix could be to set body margin (at least margin-left) to zero...
one better fix would be to use bounding box of element to get its left property to wich you substract the body marginLeft computed style:
//going to the left
function left() {
var box = player.getBoundingClientRect();
var mleft = parseFloat(getComputedStyle(document.body).marginLeft);
player.style.left = box.left - mleft - 2 + 'px';
}
//going to the right
function right() {
var box = player.getBoundingClientRect();
var mleft = parseFloat(getComputedStyle(document.body).marginLeft);
player.style.left = box.left - mleft + 2 + 'px';
}