Create a vertical layout with a clean, modern design. At the top, include a rectangular box measuring 7 cm in height, centered across the width. Leave a 1 cm space below it. Below the space, add a smaller rectangular box measuring 2 cm in height, centered across the width. Finally, add another rectangular box below that measuring 15 cm in height. The rest of the background should be white, and the boxes should have stylish borders or subtle designs