window.addEventListener("load", function myMove() {
setTimeout(() => elem.style.display = "", 40);
var elem = document.getElementById("Battle");
var pos = 37;
var id = setInterval(frame, 400);
function frame() {
if (pos == 37) {
clearInterval(id);
elem.style.display = "none"; // скрыть
} else {
pos++;
elem.style.top = pos + "%";
elem.style.left = pos + "%";
}
}
}
);