Create blocks red, blue, grey using only CSS (without changing markup, without adding wrappers). The blocks should be arranged according to the example in the image. You can style the container and the blocks themselves.

To arrange the blocks red, blue, grey according to the example in the image, using only CSS without changing the HTML markup and without adding wrappers, you can use CSS Grid or Flexbox with the order of elements and positioning.

For example, if you have three blocks with classes .red, .blue, .grey inside a container .container, and need to arrange them in a specific order or grid, you can do the following:

.container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: 1fr 1fr;
  gap: 10px;
}

.red {
  background-color: red;
  grid-column: 1 / 2;
  grid-row: 1 / 3; /* spans two rows */
}

.blue {
  background-color: blue;
  grid-column: 2 / 4;
  grid-row: 1 / 2;
}

.grey {
  background-color: grey;
  grid-column: 2 / 3;
  grid-row: 2 / 3;
}

If a different arrangement is needed, you can adjust grid-column and grid-row to fit the desired layout. The main point is to use CSS Grid or Flexbox with control over the order and size of blocks without changing the HTML.

If the example in the image differs, specify the arrangement, and I will help with the exact CSS.