Set an image for sheet background responsively?

[Pukun]

I use Milti-KPI to change sheet background to an Image.

But the size is not suitbale.

How to set the image suitable?

Or what size of image should I perpare?

[ogster1974]

Some CSS Properties that might be useful to you.

{
  background-image: url("photographer.jpg"); /* The image used */
  background-color: #cccccc; /* Used if the image is unavailable */
  background-position: center; /* Center the image */
  background-repeat: no-repeat; /* Do not repeat the image */
  background-size: cover; /* Resize the background image to cover the entire container */
}