Set backgroud-image property for grid

I would like to have an image and a label on top as a caption to the image. So i am planning to use Grid and set this image as the background for the grid and add the label on top. This is the CSS i created and assigned as classname to grid, but it doesnt work. Please help.

.my-grid {
background-image: URL('images/flipper62.png');
background-size: 100% 100%;
}
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