Zoom in and out on mouse click with CSS

Question

I want to zoom image with only CSS. The code below zooms the image when the left button of the mouse is kept pressed but I want to zoom in and out with a mouse click. How can I

Answer 1

.container img {
  margin: 100px;
  transition: transform 0.25s ease;
  cursor: zoom-in;
}

input[type=checkbox]:checked ~ label > img {
  transform: scale(2);
  cursor: zoom-out;
}