Original image is 273 x 286 px, and has a transparent area around the outside of roughly 45px.

background-size: auto auto;
background-size: contain;
background-size: cover;
background-size: 20% 25%;
background-size: 100px 400px;
background-size: 100% 250px;
background-size: 100% 250px, 20% 25%;