#game-container {
  position: relative;
  border: 1px solid red;
  height: 620px;
  width: 1102px;
  box-sizing: content-box;
}
#game-container canvas {
  position: absolute;
  top: 0;
  left: 0;
  border: 1px black solid;
  box-sizing: border-box;
}