.panel{
  width: 2100rpx; 
  height: 2970rpx;
}
.Canvas{
  width: 2100rpx; 
  height: 2970rpx;
  position: absolute;
  left:0rpx;
  top:0rpx;
}

.btnLeft{
  position: fixed;
  bottom: 30rpx;
  left:30rpx;
  background-color: #ddd;
}

.btnRight{
  position: fixed;
  bottom: 30rpx;
  right:30rpx;
  background-color: #ddd;
}