If you want to have a background image with size of cover or contain then sometimes you dont want the image to go right to the edge of your div
What you can do is apply a transparent border to your div like so:
The HTML:
<div class="myDiv"></div>
The CSS:
.myDiv{
background:url('myBackgroundImage.png') center center no-repeat;
background-size:cover;
border: 10px solid transparent;
}