如何将背景颜色放在内容容器的底部？

I would like to apply a background color, with a height of 200px. I would then like to position this background colour at the bottom of the concerned content. I have managed to achieve this across the other web pages I am working on but struggling with this page. No matter what I do, the background colour stays at the top of the content's container.I would like to apply a background color, with