var b = document.getElementById("myCanvas");
var c = b.getContext("2d");

var b = document.getElementById("myCanvas");
var c = b.getContext("2d");

var step = 50;
var angle = 0.01;
var w = c.canvas.width;
var h = c.canvas.height;
var cmTID;

c.translate(w / 2, h / 2);
drawStep();
function drawStep() {
  c.clearRect(-w / 2, -h / 2, w, h);
  c.lineWidth = 4;
  c.strokeStyle = "#ffcd8a";
  c.strokeRect(-150, -150, 300, 300);
  c.rotate(angle);
  clearTimeout(cmTID);
  cmTID = setTimeout(drawStep, step);
}