In order to make your bed more decorative or stylish, a skirt named taupe bed skirt is being used to hide the spring type box under the bed. Because some people use that space to store things. Thus to cover it and to make it more creative and elegant skirts are being used.
You can buy them easily from any nearing store or you can order online. The corners of the skirt must be touching the floor otherwise it will not look nicer. Try to use light or decent colors. Most of the people use it according to their room themes.
You can found these taupe bed skirts from Amazon and many other online sites are also working on it.

https://www.wayfair.com/bed-bath/sbs/king-bed-skirts-c431081-q~taupe-a9575~32220.html